BassimBinYoosaf The gallery as of now doesn’t even have the most basic editing features built into it, so it seems like it is indeed a fairly early development preview rather than a close to finished project. When it comes to things like that, I suggest you use the official feedback form and let the team know what kind of features you are missing.
Open the phone’s settings, search for “feedback” and select “Feedback - System”, then tap the little “Feedback” button on the lower right.