Supported File Types

Extension	How it’s processed
.md, .txt	Read as plain text
.pdf	Uploaded to the provider’s Files API (Google) or sent as base64
.png, .jpg, .jpeg, .webp	Uploaded to the provider’s Files API (Google) or sent as base64
.html	Converted to Markdown via node-html-markdown
.docx	Converted to Markdown via mammoth

For Google Gemini, binary files (PDFs and images) are uploaded to the Google Files API before ingestion — the file bytes are hosted server-side and referenced by URI, bypassing the model’s inline token limit.