The photo editor apps on mobile phones are awful, especially if it is a free app. I was editing photos on my mobile phone, and I thought that it looks good. Still, when I was transferring the photos on my personal computer, it was easy to notice that the quality of photos is deficient because of the editing app. I used the photo retouching services for improving the quality of photos that means a lot for me. The man that edited my photos did a really great job. He improved the quality and also made the lights in the photos look more realistic.
Yeah. Editing on a phone is a pain. And you will experience this pain no matter what. You can try this online video editor though. I use it on my laptop, so I have no idea how it will run on a phone, but you know, trying won't hurt. And I will recommend doing all the editing on PC anyway. I hope it helps.