Support inserting/pasting/capturing images #193
Description
It would be nice to be able to add an image to a document:
- An "insert image" button in the editor that pulls from photos or a file
- Paste an image from the clipboard
- Capture an image via org-protocol:
If permissions allow, the image could be saved next to the document, or in the ambient ATTACH directory. If permissions don't allow, the image could be stored as a data: URL pending amake/org_flutter#18.