I'm not a Mac user, but sometimes have to deal with one. To me this sounds a bit like Photos, or whatever it's called grabbing the files as they come in and putting them in their catalogue system. Because of how that system works, the files are embedded in the catalogue file, so cannot be accessed directly. I found this highly irritating when working with images on the system, since I would have to export them back out of the program, even though all that needed doing was put the images from a memory stick, and upload to website. I recall it doing something similar with videos too.