Did this get resolved for you? Same is happening to me and it's super frustrating. Adobe XD files get deleted on save, and then recreated. at least for WIndows. Here's what the version history looks like. I've opened a ticket with Dropbox, and they can't help me.
This is a huge issue for me because my links to the file break every time I save. I need to be able to static link to this file.
