I believe it’s not possible on my iPad to merge three images taken on my mirrorless camera? I don’t have CC subscription but would pay for it straight away if it was possible.Is this planned to be put in for the future?
It isn't there yet... You can do it on your computer, but not in Mobile yet. It would be a nice add-in though. Now, there are other apps such as Affinity Photo that can, but there isn't a round-trip for that.