Hello Kim Welch!
I have tried Filmic Pro in the past on my Samsung smartphone. Just like you, I have seen many experts recommending it because of its utility. The app was quite accessible, for only $15 it would offer many editing features. However, the difference between mobile and computer is huge and in my humble opinion, it is best to download your short videos and manually edit them in Adobe Premiere (or other software) on your computer. If this is not an option and you are travelling and only have your phone and you wish to quickly edit a video on the go, Filmic Pro is a good solution.