- GET /api/files/{id}/preview: an allow-list on the stored extension (downloads/preview.py) picks
image / PDF / text; served inline under `CSP: sandbox; frame-ancestors 'self'`, the type from the
table; HTML and SVG arrive as plain text; a text is its first 1 MiB (X-Preview-Truncated), sent
as UTF-8 whatever it was written in (BOM, UTF-8, else cp1250); a NUL means binary: 415
- the list says which preview each file gets (asset.preview); FE/BE contract on kinds and header
- the viewer (shared dialog shell): ← / → through the list's such files in its order, Save, open in
a tab, the file's menu; one stage height for every kind; a no-preview card offers the file
- the name, the card's picture and the menu's Preview open it; an image up to 8 MB is its own
thumbnail
peter
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