Letter.md now treats media as reusable workspace content instead of one-off attachments.
What changed
- Create image documents with a focused photo-first editor.
- Upload, browse, and reuse images from a shared Asset library.
- See which documents reference an Asset before removing it.
- Organize Assets into folders and select several images to start a new document.
- Store image documents as ordinary Markdown plus original Assets for portability.
Assets belong to the workspace, so the same file can be used safely in more than one document.