File Attachments
Attach files to give Atom visual reference, data, or audio context. Drag and drop files into the chat, or paste from your clipboard.
Supported File Types
| Type | Formats | Size Limit |
|---|---|---|
| Images | PNG, JPEG, GIF, WebP, TIFF, BMP, SVG, HEIC, HEIF | 12 MB |
| PDFs | 10 MB | |
| Documents | Word (.doc, .docx, .docm), Excel (.xls, .xlsx), PowerPoint (.ppt, .pptx), RTF, Pages, ODT | 10 MB |
| Text | TXT, Markdown, CSV, TSV, JSON, HTML, XML | 1 MB |
| Audio | WAV, MP3 | 10 MB |
Video files are not currently supported.
How to Attach Files
- Drag and drop — Drag files directly into the chat input area
- Paste — Copy an image or file and paste with Cmd/Ctrl+V
- Browse — Click the
+button in the input bar to pick files from disk
Attached files appear as cards below your message. You can remove an attachment before sending by clicking the X on its card.
What Happens to Your Files
- Images — Resized to max 1568px on the longest edge and compressed for efficient transmission
- PDFs and documents — Sent as-is to the AI model, which extracts and reads the content
- Text files — Read and included directly in your message context
- Audio — Sent as base64-encoded data for models that support audio input
Use Cases
Scripts and paper edits Attach a script, transcript, or client notes and ask Atom to organize selects or shape a sequence around them.
Visual references Drag in a style frame or title reference. Ask Atom to match colors, spacing, and typography.
Delivery specs Attach a PDF brief with durations, aspect ratios, caption rules, and export requirements.
Audio and transcripts Include an audio file and ask Atom to transcribe speech, find key moments, or create markers for edit points.
Privacy
Files you attach are sent through your selected provider. Only attach files you’re comfortable sharing with OpenAI, Anthropic, or the provider you configured through OpenCode.
Atom sends sequence frame previews to give the AI visual context of your work. It does not automatically attach full-resolution source footage or final exports; broader file access depends on the security mode you select.