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The React UI read every non-media attachment with file.text(). For a PDF that decodes the binary bytes as UTF-8, so the model received raw "%PDF ... stream ... endobj" noise instead of the document. The legacy Alpine UI ran pdf.js; that step was not ported when the React UI replaced it, but both file pickers still advertise .pdf. Add a shared readAttachmentText helper that routes PDFs through pdfjs-dist and reads other files as before. pdf.js and its worker load on first use, so the main bundle does not grow. A PDF that cannot be parsed or has no text layer (scanned, encrypted, damaged) is rejected with a toast instead of being attached as an empty or garbage file. Cover the chat and home paths with Playwright specs that build a real PDF in the test. Assisted-by: Claude Code:claude-sonnet-5-5 [playwright] [eslint] Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>