I found that after I remove a markdown note, the pictures of that note would remain in the system, which is a waste of space, is there any plan to remove the pictures(and attachments) as well after a markdown note is removed?
Yes they will be deleted a few days after being removed from the note. This is a safety measure to prevent resources from being deleted by mistake. If you really need to delete the resource you can use the resource management screen, but it’s not recommended.