[TomasPalsson]

Why

Code-interpreter decks still show "High-fidelity renderer unavailable or returned no slide content. Showing the simplified slide-list view below." and a text-only list, even with LibreOffice previews live (#94, #95).

LibreOffice converts fine, but its PDF is embedded base64 in the stored preview HTML (attachment.text, 512 KB cap). Any PDF over ~380 KB makes tryLibreOfficePreview return null silently. The storage-backed file shell (upstream LibreChat-AI#16518) only moved the source file out of the HTML, not the PDF. Repro: an 8-slide deck with a matplotlib chart per slide is 365 KB as .pptx and 466 KB as PDF, so it falls back to the slide list.

What

Squash of upstream LibreChat-AI#17450 onto aproorg/0.8.8:

• PDF shell: when fileConfig.officePreview.enabled and the PDF is too big to embed, store a PDF shell. That is the file-shell markers, a new lc-doc-format=pdf marker, and an empty data slot.
• ?preview=pdf on the existing owner and shared-link download routes. It converts the stored file on demand behind the same auth, capped at officePreview.fileSizeLimit, with a zip-bomb check.
• useOfficeFileShell fetches the PDF for a PDF shell and fills it. pdf.js renders the slides.
• PDFs that fit keep the inline path, unchanged.

Tests

• packages/api npx jest src/files → 1195/1195. This includes the real-soffice integration tests for the shell over the cap and for officeFileToPdf.
• data-provider file-config → 264/264. client Artifacts + Files → 114/114. api files + share routes → 135/135.
• tsc, ESLint and Prettier are clean.
• End to end: the 8-chart deck now stores a 6.5 KB PDF shell, ?preview=pdf returns the 465 KB PDF, and the filled shell renders all 8 slides in Chrome:

Notes

• The PDF is re-converted on each view, through the existing one-at-a-time queue (a ponytail: comment marks it). Store the PDF next to the file if repeat views get slow.
• No config change needed where OFFICE_PREVIEW_LIBREOFFICE=pptx is already set, because officePreview.enabled defaults to true.

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