[curt.clifton]

Originally Posted by kasi

I dragged a file into the notes and although the notes symbol was still visible, the dragged file went missing (I checked weeks later as I wanted to work on this task). I found the file in the OmniFocus.ofocus data directory, but it still doesn't show up in the notes.

There was (is?) a bug where an attachment for a deleted action would remain in the database, but not accessible from the UI. So, the fact that the file was in the data directory does not necessarily mean that OF lost data. It is possible that either the action was deleted and recreated without the note, or perhaps that editing of the note was cancelled after the attachment was made. Of course, it's also possible that OF lost data, but I've never seen that even in the very earliest sneaky peeks of v1.0.