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Attach a file to a message in a Thread or drop one onto a Playbook, and Ana can read it, query it, or use it as the input to an analysis — no separate import step. Threads and Playbooks upload files through the same mechanism, so what you can attach and how it’s handled is identical in both.

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Supported File Types

Ana classifies every upload into one of four categories. A file with no extension, or an extension not listed below, is rejected.

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Size Limits

  • Per file, at upload time: There’s no fixed file-size ceiling on the upload itself when attaching directly in the TextQL UI — bounded in practice only by your own upload speed and browser stability. (The separate public API has its own stricter limit — see the note below.)
  • Tabular files (CSV, TSV, etc.): Keep under 5 MB — larger files upload fine but fail with a “file too large” error when Ana tries to read them.
  • PDFs are capped by page count rather than file size, and the cap depends on the model you’re chatting with: 100 pages for most Claude models, 30 pages for a smaller subset. A PDF over its model’s page limit is rejected before upload with a message telling you the limit.
  • Per session: There’s no aggregate cap on total bytes uploaded across a single Thread or Playbook — each file is uploaded and processed independently.
These are the limits for uploading directly in the TextQL UI. If you’re attaching files through the public API instead, that path enforces its own, stricter limits: 50 MB per file and 10 files per request.

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Turning File Upload Off

Admins can disable file upload for the whole organization from Settings → Features. When it’s off, the attach control disappears from both the Thread composer and Playbook file drop for every user in the org — there’s no per-user or per-role override.

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Limitations

  • An unrecognized or missing file extension is rejected outright — there’s no fallback “treat as text” behavior for arbitrary binary files.
  • Beyond the 5 MB content-load cap above, a tabular file over 10 MB isn’t copied into the sandbox for direct reading (e.g. via a Python cell) — Ana still has the processed dataset, just not the original raw file, and previews are additionally subject to their own row limits.
  • PDF, PowerPoint, and Word support depends on the file being well-formed; corrupted or password-protected files will fail to process even though the upload succeeds.