I’ll try…
When I use the phone app to see which pictures are backedup to the inserted iXpand, then I see multiple days with multiple images/videos as expected. But when I insert the iXpand into my mac and check what is on there via the finder, then I only see one date folder (5th of may, which is the first day I used the thing) nested into a year folder in the Camera Roll Backup folder. Where I would expect multiple folders to correspond with the multiple days like I see on the app. Extra in the folder are only two files according to the finder on my mac. Whilst the app does show me more than that.
UPDATE: I get the same result on a windows machine (windows 7)
Does that help any?
