Export the backup file or the source file for sharing
Except PDF and picture , maby the best way for share is exporting one or some notes as a backup file. (Export the backup file or the source file for sharing. )
Now we can export to PDF or picture for sharing, but they are not convenient for edit again. usually I share backupfile to my partner. But you know, in backup file, usually there are many notes which I not really want to share.