Last reviewed
Correct answer: A. Documents such as PDF and DOCX, and images such as PNG and JPEG
Explanation
The principle — Claude reads what you attach, and the accepted list is broad but not unlimited.
Why the key is correct — documents including PDF, DOCX, CSV, TXT, HTML, RTF, ODT, EPUB, JSON and XLSX are accepted, alongside images in JPEG, PNG, GIF and WebP.
Why the others are wrong — attachments are not restricted to plain text or to images, documents do not require a project, and the list does not extend to arbitrary files.
Remember this — attach the real document rather than describing it or retyping it.
Sources — Anthropic's file upload documentation.
Sources
“Up to 20 files per chat.”
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