Users would much rather work with logical items. A "photo" which includes metadata, photo files, photo edits, ratings, face/object detections, and etc. as a single "thing". A tweet thread. A blog post on Medium or in WordPress. A Google Doc or Sheet.
The question is how do you provide that seamless "anywhere, anytime" experience while keeping that data as local to the device as possible? Files by themselves just can't solve that. There needs to be a protocol, a data format, and mobile OS support.