There is no proper list of features, nowhere can I learn which image formats it supports, how it generates thumbnails and previews (on the fly or via database?). I have to assume it does not support much and thus most likely being too limited in order to be taken seriously.
The Developer has completely Broke this app in older os with recent updates also now has ads when you open the app and now dark mode only which is stupid and he calls this improvments. Stay away this app is JUNK!
The reason this app has not been reviewed up to now is probably that there is no way to try it out without paying for it. Clearly that's a losing proposition. There are not even any reviews on the App Store. I certainly don't want to spend $10 for a pig-in-a-poke. No try, no buy.