I've found that the best experience of self hosting excalidraw is actually using it inside nextcloud, it's called whiteboard over there but it's actually excalidraw. Setup is bit finicky but workable if you understand how reverse proxies work.

Nextcloud allows you to have an actual file based workflow and collaboration works out of the box, so if you give someone the url they can see what you're doing and let them do edits as well.