Well, no, no effective way…
Basically, what you’re missing is two things:
- a link between each element of a note and that note (this is not the case with images, which have no visible link)
- A cascading delete function.
- You should also be aware that some deletes only remove; that a real delete also involves emptying the trash; and that despite all this, the space is not necessarily freed (local or server-side space)

- And for more complex thing to delete (with property, type, etc)… fortunately, this is not your request.
For you, here’s a request close to your needs (there are plenty of others), please vote if you want :
Alternative :
You can create a Query to find all item without link and/or backlinks.
I thinks it can work for files except image (all your images will be without links).
- Create a query with all object (Property : object type), add “Links”, “Backlinks” and filter to show all unlinked objects.
