Export for Screens: exports warn when an image couldn't be decoded or a font is missing

Export for Screens wrote each file with fileio::encode, which drops the
encoder's warnings, and its replies had no `warnings` key. When the art
held an image that the renderer could not decode, or type in a font
that is not installed, the files lacked the image or used the fallback
font, and neither the reply nor the status bar said so. document.export
returns the same notes in `warnings`, and Export As shows the first in
the status bar.

document.exportForScreens and assets.export now collect the warnings of
every file they export, each once, and every reply carries them in
`warnings`. The export still writes or returns every file. When there
are warnings, the Export for Screens dialog and the Asset Export panel
show the first in the status bar as Save As shows a save's notes.

Docs: docs/mcp.md (Export for Screens), docs/control-protocol.md.

crates/engine/src/cmd/fileio/mod.rs

@@ -142,7 +142,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Export for Screens",
             ["File", "Export"],
             None,
-            "{folder?, zip?: false (one store-only .zip of every file: no folder → {name, dataBase64, bytes, files: [name…]}; with a folder it is written there → {path, bytes, files}), artboards?: [index…] | range?: \"1-3\" (default all), assets?: [asset id…] (instead of artboards: each asset's art alone, cropped to its bounds and named after the asset; see assets.list), layers?: [layer id…] (instead of artboards: each layer's art alone, sublayers included, named after the layer), selection?: one|each (instead of artboards: the selected art as one file, or a file per selected object, named after it), fullDocument?: false (one file per format instead: a PDF of every artboard, other formats the bounds of all visible art, named after the document), includeBleed?: false (artboards grown by the document's bleed), exportPreset?: (a preset of document.exportPresets.list: its settings, under these params), subfolders?: false (each row's files in a sub-folder: its folder, else its size for raster (1x, 2x, 100w…) or its format (SVG, PDF)), folders?: none|rows (as subfolders)|format (a folder per extension: png, svg, pdf…)|item (a folder per artboard, asset, layer or object)|itemFormat (item/extension) (default: rows with subfolders or a preset, else none), name?: (a file name pattern instead of the item's name, with <filename> for the document, <name> for the artboard, asset, layer or object, <index> from 1, #### for the counter zero-padded to the run of #, <format>, <scale>, <suffix> (else the row's suffix ends the name), YYYYMMDD, YYYY-MM-DD, YYYY, <date>, <time>, <YYYY>, <MM>, <DD>, <hh>, <mm> and <ss>; a trailing .ext is dropped, as in `COMPANY-Logo-<filename>-####-YYYYMMDD`; different files it names alike get -2, -3…), counterStart?: 1, counterPer?: item (every file of an item has its number)|file, date?: YYYY-MM-DD (the date the pattern uses; default today, UTC), preset?: mobile (PNG 1x, 2x, 3x) | density (PNG 0.75x–4x in ldpi…xxxhdpi sub-folders) instead of formats (turns subfolders on), formats?: [{format: png|png8|jpg|webp|gif|tiff|bmp|tga|psd|svg|svgz|pdf|eps|ai|vectorcraft, scale?: 1 | \"2x\" | \"100w\" | \"100h\" | \"72ppi\", width?: px | height?: px | ppi? (raster only; width, then height, then ppi win over scale), suffix?: (raster default: @2x, @100w, @100h, none at 1x; vector formats drop size suffixes), folder?: (its sub-folder), quality?: (jpg 0–100), …the format's options (antiAlias, background, preset (pdf)…)}], settings?: {png|png8|jpg|webp|gif|tiff|bmp|tga|psd|svg|svgz|pdf|eps|ai|vectorcraft: {…options for every row of that format}} (rows' own options win), prefix?, antiAlias?: none|art|type (raster rows without their own), openLocation?: (remembered; the app shows the files after exporting)} one file per artboard and format (a PDF holds its artboard alone; artboards with the same name, in any case, get -2, -3…; an unnamed one is Artboard-N) → {files: [path…]}; no folder → {files: [{name, dataBase64}]} (names include sub-folders: 2x/Icon@2x.png). eps, ai and vectorcraft rows write a document of the item alone (its one artboard). The params (but zip and assets) are remembered in the document (document.exportSettings; not an undo step)",
+            "{folder?, zip?: false (one store-only .zip of every file: no folder → {name, dataBase64, bytes, files: [name…]}; with a folder it is written there → {path, bytes, files}), artboards?: [index…] | range?: \"1-3\" (default all), assets?: [asset id…] (instead of artboards: each asset's art alone, cropped to its bounds and named after the asset; see assets.list), layers?: [layer id…] (instead of artboards: each layer's art alone, sublayers included, named after the layer), selection?: one|each (instead of artboards: the selected art as one file, or a file per selected object, named after it), fullDocument?: false (one file per format instead: a PDF of every artboard, other formats the bounds of all visible art, named after the document), includeBleed?: false (artboards grown by the document's bleed), exportPreset?: (a preset of document.exportPresets.list: its settings, under these params), subfolders?: false (each row's files in a sub-folder: its folder, else its size for raster (1x, 2x, 100w…) or its format (SVG, PDF)), folders?: none|rows (as subfolders)|format (a folder per extension: png, svg, pdf…)|item (a folder per artboard, asset, layer or object)|itemFormat (item/extension) (default: rows with subfolders or a preset, else none), name?: (a file name pattern instead of the item's name, with <filename> for the document, <name> for the artboard, asset, layer or object, <index> from 1, #### for the counter zero-padded to the run of #, <format>, <scale>, <suffix> (else the row's suffix ends the name), YYYYMMDD, YYYY-MM-DD, YYYY, <date>, <time>, <YYYY>, <MM>, <DD>, <hh>, <mm> and <ss>; a trailing .ext is dropped, as in `COMPANY-Logo-<filename>-####-YYYYMMDD`; different files it names alike get -2, -3…), counterStart?: 1, counterPer?: item (every file of an item has its number)|file, date?: YYYY-MM-DD (the date the pattern uses; default today, UTC), preset?: mobile (PNG 1x, 2x, 3x) | density (PNG 0.75x–4x in ldpi…xxxhdpi sub-folders) instead of formats (turns subfolders on), formats?: [{format: png|png8|jpg|webp|gif|tiff|bmp|tga|psd|svg|svgz|pdf|eps|ai|vectorcraft, scale?: 1 | \"2x\" | \"100w\" | \"100h\" | \"72ppi\", width?: px | height?: px | ppi? (raster only; width, then height, then ppi win over scale), suffix?: (raster default: @2x, @100w, @100h, none at 1x; vector formats drop size suffixes), folder?: (its sub-folder), quality?: (jpg 0–100), …the format's options (antiAlias, background, preset (pdf)…)}], settings?: {png|png8|jpg|webp|gif|tiff|bmp|tga|psd|svg|svgz|pdf|eps|ai|vectorcraft: {…options for every row of that format}} (rows' own options win), prefix?, antiAlias?: none|art|type (raster rows without their own), openLocation?: (remembered; the app shows the files after exporting)} one file per artboard and format (a PDF holds its artboard alone; artboards with the same name, in any case, get -2, -3…; an unnamed one is Artboard-N) → {files: [path…]}; no folder → {files: [{name, dataBase64}]} (names include sub-folders: 2x/Icon@2x.png); every reply has warnings: [the encoders' warnings for the files, each once: an image that couldn't be decoded, type written in the fallback font…]. eps, ai and vectorcraft rows write a document of the item alone (its one artboard). The params (but zip and assets) are remembered in the document (document.exportSettings; not an undo step)",
             has_doc,
             screens::export_for_screens
         ),

crates/engine/src/cmd/fileio/screens.rs

@@ -21,7 +21,7 @@ use super::encode::single_artboard;
 use super::export::{isolated, selected_artwork, without_artboards};
 use super::naming::{self, NameParts};
 use super::{
-    ARTBOARD_PARAMS, ArtboardPick, Format, artboard_file_names, create_dir, distinct_names, encode, unique_file_names, with_black_output, writable,
+    ARTBOARD_PARAMS, ArtboardPick, Format, artboard_file_names, create_dir, distinct_names, encode_with_warnings, unique_file_names, with_black_output, writable,
     write_file,
 };
 
@@ -561,7 +561,8 @@ pub(super) fn presets_delete(s: &mut Session, p: &Value) -> Result<Value> {
 /// Every chosen artboard (asset, layer, selected object) in every format row, one file each (a PDF
 /// holds its artboard alone), or with `fullDocument` one file per row (a PDF of every artboard,
 /// else the bounds of all art). Items that share a name get `-2`, `-3`… instead of overwriting, and
-/// so do different files the `name` pattern gives one name.
+/// so do different files the `name` pattern gives one name. The reply's `warnings` lists every
+/// warning the encoders give for the files, each once.
 pub(crate) fn export(s: &mut Session, p: &Value) -> Result<Value> {
     let o = ScreenParams::of(p)?;
     let rows = rows_of(s, p, o.preset.as_deref())?;
@@ -608,8 +609,18 @@ pub(crate) fn export(s: &mut Session, p: &Value) -> Result<Value> {
     let crop = rows.iter().any(|r| r.format.id != "pdf");
     let items = items(&doc, &o, selection, &selected, &filename, crop)?;
     let mut out = Output::default();
+    // The encoders' warnings for every file, each once.
+    let mut warnings: Vec<String> = Vec::new();
     // Appearance of Black › Printing / Exporting for RGB raster rows.
-    let write = |doc: &Document, format: &str, options: &Value| encode(doc, format, &with_black_output(s, options));
+    let mut write = |doc: &Document, format: &str, options: &Value| -> Result<Vec<u8>> {
+        let (bytes, notes) = encode_with_warnings(doc, format, &with_black_output(s, options))?;
+        for w in notes {
+            if !warnings.contains(&w) {
+                warnings.push(w);
+            }
+        }
+        Ok(bytes)
+    };
     // A whole-document copy of an artboard, for the formats that write documents to edit.
     let mut board_docs: std::collections::HashMap<usize, Arc<Document>> = std::collections::HashMap::new();
     let mut files = 0u64;
@@ -669,15 +680,19 @@ pub(crate) fn export(s: &mut Session, p: &Value) -> Result<Value> {
             Some(dir) => {
                 let path = format!("{dir}/{zip_name}");
                 write_file(&path, &zip)?;
-                Ok(json!({ "path": path, "bytes": zip.len(), "files": names }))
+                Ok(json!({ "path": path, "bytes": zip.len(), "files": names, "warnings": warnings }))
             }
-            None => Ok(json!({ "name": zip_name, "dataBase64": vectorcraft_format::base64_encode(&zip), "bytes": zip.len(), "files": names })),
+            None => Ok(
+                json!({ "name": zip_name, "dataBase64": vectorcraft_format::base64_encode(&zip), "bytes": zip.len(), "files": names, "warnings": warnings }),
+            ),
         };
     }
     Ok(match folder {
-        Some(_) => json!({ "files": out.written }),
+        Some(_) => json!({ "files": out.written, "warnings": warnings }),
         None => {
-            json!({ "files": out.kept.iter().map(|(name, bytes)| json!({ "name": name, "dataBase64": vectorcraft_format::base64_encode(bytes) })).collect::<Vec<_>>() })
+            let files: Vec<Value> =
+                out.kept.iter().map(|(name, bytes)| json!({ "name": name, "dataBase64": vectorcraft_format::base64_encode(bytes) })).collect();
+            json!({ "files": files, "warnings": warnings })
         }
     })
 }

crates/engine/src/cmd/fileio/tests_screens.rs

@@ -200,6 +200,45 @@ fn a_zip_is_written_into_the_folder() {
     let _ = std::fs::remove_dir_all(dir);
 }
 
+/// The warnings in `r` that contain `text`.
+fn warned<'a>(r: &'a Value, text: &str) -> Vec<&'a str> {
+    r["warnings"].as_array().unwrap().iter().filter_map(Value::as_str).filter(|w| w.contains(text)).collect()
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+#[test]
+fn every_reply_says_once_when_an_image_could_not_be_decoded() {
+    let mut s = session(1);
+    let rows = json!([{"format": "png"}, {"format": "jpg", "scale": "2x"}]);
+    assert_eq!(export(&mut s, json!({ "formats": rows }))["warnings"], json!([]));
+    // The renderer can't decode the placed image and draws nothing in its place.
+    crate::tests_menucmds::place_undecodable_png(&mut s);
+    let dir = std::env::temp_dir().join(format!("vc-screens-undecoded-{}", std::process::id()));
+    let folder = dir.to_string_lossy().replace(std::path::MAIN_SEPARATOR, "/");
+    for p in [
+        json!({ "formats": rows }),
+        json!({ "formats": rows, "zip": true }),
+        json!({ "formats": rows, "folder": folder }),
+        json!({ "formats": rows, "folder": folder, "zip": true }),
+        json!({ "formats": rows, "fullDocument": true }),
+    ] {
+        let r = export(&mut s, p.clone());
+        assert_eq!(warned(&r, "couldn't be decoded").len(), 1, "{p}: {}", r["warnings"]);
+    }
+    assert_eq!(std::fs::read_dir(&dir).unwrap().count(), 3, "the files are still written");
+    let _ = std::fs::remove_dir_all(dir);
+}
+
+#[test]
+fn type_in_a_missing_family_is_named_once_for_every_format() {
+    let mut s = session(2);
+    s.execute("text.create", &json!({"x": 5, "y": 20, "text": "Ab", "font": "Nonexistent Sans Probe"})).unwrap();
+    let r = export(&mut s, json!({"formats": [{"format": "png"}, {"format": "pdf"}, {"format": "eps"}]}));
+    let fallback = warned(&r, "fallback font");
+    assert_eq!(fallback.len(), 1, "{}", r["warnings"]);
+    assert!(fallback[0].contains("Nonexistent Sans Probe"), "{fallback:?}");
+}
+
 #[test]
 fn full_document_gives_one_file_per_format() {
     let mut s = session(3);

crates/ui-egui/src/dialogs/tests_screens.rs

@@ -249,6 +249,43 @@ fn the_web_downloads_one_zip_or_the_file() {
     assert_eq!(image::load_from_memory(&log[0].1).unwrap().to_rgba8().get_pixel(1, 1).0, [0, 0, 0, 255], "the PNG settings' background");
 }
 
+#[test]
+fn the_status_bar_says_when_an_image_could_not_be_decoded() {
+    const NOTE: &str = "with 1 note(s): an image couldn't be decoded and is missing from the picture";
+    // A PNG whose header reads but whose pixel data is cut short: the renderer draws nothing for it.
+    let mut png = Vec::new();
+    image::RgbaImage::from_pixel(64, 32, image::Rgba([200, 30, 30, 255]))
+        .write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png)
+        .unwrap();
+    let idat = png.windows(4).position(|w| w == b"IDAT").unwrap();
+    png.truncate(idat + 8);
+    let place = |app: &mut VectorcraftApp| {
+        app.run("file.place", json!({"name": "cut.png", "dataBase64": vectorcraft_format::base64_encode(&png), "at": [10, 10]})).unwrap()
+    };
+    let rows = json!([{"format": "png", "scale": "1x", "suffix": ""}, {"format": "jpg", "scale": "2x", "suffix": "@2x"}]);
+    let dir = temp_folder("undecoded");
+    let folder = dir.to_string_lossy().replace('\\', "/");
+    let (mut desktop, log) = app(1, false);
+    desktop.run("file.exportForScreens", json!({"folder": folder, "formats": rows})).unwrap();
+    assert_eq!(desktop.ui.status, format!("Exported 2 file(s) to {folder}"));
+    place(&mut desktop);
+    desktop.run("file.exportForScreens", json!({"folder": folder, "formats": rows, "openLocation": true})).unwrap();
+    assert_eq!(desktop.ui.status, format!("Saved {folder} {NOTE}"));
+    assert_eq!(log.borrow().len(), 1, "Open Location still shows the first file");
+    let r = desktop.run("file.exportForScreens", json!({"folder": folder, "formats": rows, "zip": true})).unwrap();
+    assert_eq!(desktop.ui.status, format!("Saved {} {NOTE}", r["path"].as_str().unwrap()));
+    // The Asset Export panel's export goes the same way.
+    desktop.run("select.all", json!({})).unwrap();
+    desktop.run("assets.add", json!({"multiple": false})).unwrap();
+    crate::io::export_files(&mut desktop, "assets.export", json!({"folder": folder, "formats": rows})).unwrap();
+    assert_eq!(desktop.ui.status, format!("Saved {folder} {NOTE}"), "assets.export");
+    let (mut web, _) = app(1, true);
+    place(&mut web);
+    web.run("file.exportForScreens", json!({"zip": true, "formats": rows})).unwrap();
+    assert_eq!(web.ui.status, format!("Saved Untitled-1.zip {NOTE}"));
+    let _ = std::fs::remove_dir_all(dir);
+}
+
 #[test]
 fn a_preset_export_reopens_on_its_rows() {
     let (mut app, _) = app(1, true);

crates/ui-egui/src/io.rs

@@ -566,11 +566,16 @@ fn view_file(app: &mut VectorcraftApp, path: &str) {
 
 /// "Saved <path>", with the first of the result's warnings.
 pub(crate) fn report_saved(app: &mut VectorcraftApp, path: &str, r: &Value) {
+    app.status(saved_status(path, r));
+}
+
+/// [`report_saved`]'s message.
+fn saved_status(path: &str, r: &Value) -> String {
     let warnings: Vec<&str> = r["warnings"].as_array().map(|w| w.iter().filter_map(Value::as_str).collect()).unwrap_or_default();
-    app.status(match warnings.first() {
+    match warnings.first() {
         Some(first) => format!("Saved {path} with {} note(s): {first}", warnings.len()),
         None => format!("Saved {path}"),
-    });
+    }
 }
 
 /// Write a planned save through the services and report it in the status bar.
@@ -828,7 +833,9 @@ pub(crate) fn open_in_app(app: &mut VectorcraftApp, path: &str) -> Result<(), St
 
 /// File → Export for Screens with `document.exportForScreens` params: the files go into `folder`;
 /// without one the web downloads them (the ZIP, or each file) and the other frontends get them
-/// back as base64. With `openLocation`, the file manager shows the first file written.
+/// back as base64. With `openLocation`, the file manager shows the first file written. When an
+/// export into a folder or a download has warnings, the status bar shows the first as
+/// [`report_saved`] shows a save's notes: "Saved <folder, ZIP or first download> with n note(s): …".
 pub fn export_for_screens(app: &mut VectorcraftApp, params: Value) -> Result<Value, String> {
     export_files(app, "document.exportForScreens", params)
 }
@@ -839,6 +846,7 @@ pub(crate) fn export_files(app: &mut VectorcraftApp, id: &str, params: Value) ->
     let folder = params.get("folder").and_then(Value::as_str).unwrap_or_default().to_string();
     let r = app.run(id, params)?;
     let count = r["files"].as_array().map_or(0, Vec::len);
+    let warned = r["warnings"].as_array().is_some_and(|w| !w.is_empty());
     // Files that came back as bytes: (name, base64).
     let returned: Vec<(&str, &str)> = match r["dataBase64"].as_str() {
         Some(zip) => vec![(r["name"].as_str().unwrap_or("Export.zip"), zip)],
@@ -849,6 +857,9 @@ pub(crate) fn export_files(app: &mut VectorcraftApp, id: &str, params: Value) ->
     if returned.is_empty() {
         let first = r["path"].as_str().or_else(|| r["files"][0].as_str());
         let mut status = format!("Exported {count} file(s) to {folder}");
+        if warned {
+            status = saved_status(r["path"].as_str().unwrap_or(&folder), &r);
+        }
         if open_location
             && let Some(first) = first
             && let Err(e) = reveal_path(app, first)
@@ -865,7 +876,10 @@ pub(crate) fn export_files(app: &mut VectorcraftApp, id: &str, params: Value) ->
             [(name, _)] => (*name).to_string(),
             files => format!("{} files", files.len()),
         };
-        app.status(format!("Downloaded {what}"));
+        match returned.first().filter(|_| warned) {
+            Some((name, _)) => report_saved(app, name, &r),
+            None => app.status(format!("Downloaded {what}")),
+        }
     }
     Ok(r)
 }

docs/control-protocol.md

@@ -119,7 +119,7 @@ the two can still win that race.
 | `engine.execute` `document.exportForOffice` | `{}` / `{path?, ppi?: 72 \| 150 \| 300, transparent?, artboard?}` | File → Save for Office Documents…: without params opens `saveForOffice` (fields `ppi`, `transparent`, `artboard`; OK picks the file); with params writes the artboard as a PNG (`path`, else a picked file) → `{path}`. Headless it returns `{dataBase64, width, height}` |
 | Native file dialogs | any command with no `path` that needs one (`file.open`, `file.saveAs`, `file.place`, exports…) | on macOS (a sheet on the window) and Linux the dialog doesn't hold the window: the call returns `"cancelled"` at once, `ui.inspect` reports `fileDialog`, and when the person at the computer picks a file the command runs again on the document it was asked for. While it is open another dialog is refused: that call returns `"cancelled"` too, and the status bar (`ui.inspect` → `ui.status`) says `"A file dialog is open: choose there first"`; on macOS `app.quit`, `file.close` and `file.closeAll` return that message and the menu bar does nothing (#592, #867). On Windows the dialog is shown in line: the call returns once it closes. Pass `path` to skip the dialog |
 | Background Save / Export | `app.save`, `app.export {path}`, `file.save`, `file.saveAs`, `file.saveCopy` | with the `backgroundSave` / `backgroundExport` preferences on (the default) the desktop app writes the file from a snapshot on a worker thread: the call returns `{path, background: true, status}` at once, `ui.inspect` lists the jobs still running in `background` (labels such as `"Saving a.vectorcraft"`), and the document counts as saved (as of the snapshot) once its file is written. Quit and Close wait for them. With the preferences off (`prefs.set`), saves return once written |
-| `engine.execute` `file.exportForScreens` | `{}` / `{…document.exportForScreens params}` | without params opens `exportForScreens` on the settings the document last exported with (`document.exportSettings`). While the Artboard tool is in use, the artboards it has selected (its `selected` option, the rows the Artboards panel highlights) are checked instead, and `select` is `range`, or `all` when every artboard is selected. Fields: `tab` (`artboards` \| `assets` \| `layers` \| `selection`; OK reads Export Layer or Export Selection on those), `layers` ([layer id…] checked), `selectionMode` (`one` \| `each`), `name` (the file name pattern of `document.exportForScreens`), `counterStart`, `folders` (`none` \| `rows` \| `format` \| `item` \| `itemFormat`), `exportPreset` (the preset applied last), `__savePreset` (the name typed to save one), `select` (`all` \| `range` \| `full`), `range` ("1-3, 5"), `boards` (a bool per artboard; checking them sets `select` and `range`), `includeBleed`, `folder` (desktop; default the Desktop, else home), `openLocation`, `subfolders`, `prefix`, `preset` (`""` \| `mobile` \| `density`), `formats` (rows `{format, scale: "2x" \| "100w" \| "100h" \| "72ppi", suffix, quality?, folder?}`), `settings` (`{png \| png8 \| jpg \| webp \| gif \| svg \| pdf: {…options}}`, the gear's Format Settings; `__settings` names the format shown). `ui.dialog.confirm` exports (a bad range or no folder keeps it open); on the web OK reads "Download" and the files download (several as one `.zip`). With params it runs `document.exportForScreens`: no `folder` returns the files (or with `zip: true` one store-only zip) as `dataBase64`; with `openLocation` the first file is shown in the file manager |
+| `engine.execute` `file.exportForScreens` | `{}` / `{…document.exportForScreens params}` | without params opens `exportForScreens` on the settings the document last exported with (`document.exportSettings`). While the Artboard tool is in use, the artboards it has selected (its `selected` option, the rows the Artboards panel highlights) are checked instead, and `select` is `range`, or `all` when every artboard is selected. Fields: `tab` (`artboards` \| `assets` \| `layers` \| `selection`; OK reads Export Layer or Export Selection on those), `layers` ([layer id…] checked), `selectionMode` (`one` \| `each`), `name` (the file name pattern of `document.exportForScreens`), `counterStart`, `folders` (`none` \| `rows` \| `format` \| `item` \| `itemFormat`), `exportPreset` (the preset applied last), `__savePreset` (the name typed to save one), `select` (`all` \| `range` \| `full`), `range` ("1-3, 5"), `boards` (a bool per artboard; checking them sets `select` and `range`), `includeBleed`, `folder` (desktop; default the Desktop, else home), `openLocation`, `subfolders`, `prefix`, `preset` (`""` \| `mobile` \| `density`), `formats` (rows `{format, scale: "2x" \| "100w" \| "100h" \| "72ppi", suffix, quality?, folder?}`), `settings` (`{png \| png8 \| jpg \| webp \| gif \| svg \| pdf: {…options}}`, the gear's Format Settings; `__settings` names the format shown). `ui.dialog.confirm` exports (a bad range or no folder keeps it open); on the web OK reads "Download" and the files download (several as one `.zip`). With params it runs `document.exportForScreens`: no `folder` returns the files (or with `zip: true` one store-only zip) as `dataBase64`; with `openLocation` the first file is shown in the file manager. When `warnings` is not empty, an export into a folder or a download shows the first in the status bar as Save As shows a save's notes |
 | Export for Screens' Assets tab, Asset Export panel | `ui.dialog.set` `tab: "assets"`, `assets: [asset id…]`; `window.panel {panel: "assetExport"}` | on the Assets tab of `exportForScreens` the `assets` field lists the checked asset ids (all of them when it opens); `ui.dialog.confirm` runs `document.exportForScreens {assets}` (nothing checked keeps it open) and OK reads "Export Asset". The Asset Export panel acts through `assets.*` and shares the format rows with the dialog (`assets.settings.set`) |
 | `engine.execute` `file.exportSelection` | `{multiple?}` | File › Export Selection…: collects the selected objects as assets (`assets.add`; one per object unless `multiple` is false) and opens `exportForScreens` on its Assets tab with just them checked → `{assets}`. `document.exportSelection` still exports the selection in one go, without the dialog |
 | CSS Properties panel | `window.panel {panel: "cssProperties"}`; `engine.execute` `css.copy` / `css.exportFile` | the panel shows `css.selection` of the selection (after Generate CSS, while nothing is selected, `css.generate`); its menu holds the options the commands take (`units`, `position`, `dimensions`, `unnamed`, `rasterize`). `css.copy {scope?, …options}` copies the CSS to the clipboard → `{css, rules}`; `css.exportFile {path?, scope?, …options}` writes `css.export` to `path` (else a picked file; the web downloads it) with the pictures of rasterized art next to it → `{path, rules, images}` |

docs/mcp.md

@@ -2903,7 +2903,9 @@ format its options. On every platform, `/`, `\`, `:`, `<`, `>`, `"`, `|`, `?`, `
 prefix, a suffix, a name pattern or an item's name become `-` in file and folder names, a folder name ends without
 periods or spaces, and a Windows device name (`CON`, `PRN`, `AUX`, `NUL`, `COM1` to `COM9`, `LPT1` to `LPT9`) that
 is the whole name or comes before its first period gets a `-` after it (`CON-.png`). The document remembers the last
-params: `document.exportSettings`.
+params: `document.exportSettings`. As in `document.export`,
+the reply's `warnings` lists the notes of every file exported (an image that couldn't be decoded, type written in the
+fallback font…), each note once; the export still writes or returns every file.
 
 Batch exports (#1935):
 - **What:** `layers: [id…]` (each layer's art alone) or `selection: "one" | "each"` instead of artboards