Phoenix File Uploads

RULES — Follow these with no exceptions

1. Use manual uploads (NOT auto_upload: true) for form submission patterns
2. Always add upload directory to static_paths() — files won't be accessible without this
3. Handle upload errors — display error_to_string/1 output in templates
4. Create upload directories with File.mkdir_p! before saving files
5. Generate unique filenames — prevent collisions and path traversal attacks
6. Validate file types server-side — never trust client MIME types
7. Restart server after changing static_paths() — changes don't apply until restart

Upload Configuration

Manual Upload (Recommended for Most Cases)