I tried using it several times in recent years, and whenever trying to upload files, I had lots of issues. Filed some bugs, never got them resolved, and ended up giving up after several of my photos and descriptions were lost (or never properly uploaded).

I really want the Commons Mobile app to work, and I don't know why it always failed with my Pixel phone, but it was a really frustrating experience.

I had the same experience earlier but recently (perhaps within a year) the app has improved significantly.