I have a Macbook and a Mac Mini at home, connected with Universal Control. When I copy-paste some big group of files (say, 250GB of photos) the OS creates a copy of all those files under shared-clipboard in Library (filling up disk space in short time) even if I don't even move the cursor to other devices. It doesn't even delete those files and clear up disk space even after I paste it. This is a design flaw, it shouldn't be like this.
Universal Control Copy Paste Issue
Those are probably clones that don't consume any additional storage space. You can verify this in Disk Utility. Finder isn't able to see low-level storage blocks.
I agree with @Etresoft, but I would also point out that these forums aren't the place for your post.
These are the Developer Forums, where developers of apps for Apple's platforms ask each other for hints and tips on coding. You are talking to other third-party developers here.
While some Apple employees do visit these forums, they are likely to agree with @Etresoft in this instance, and, if they don't agree, they would probably point out that your issue is more suited to the Apple Support Forums.
(And yes, I'm aware of your other post regarding being unable to post in the other forums, but that does not negate the fact that this is not the place for your post.)