I've done something very similar for my wife: She likes reading otome visual novel games on Android and the game design/monetization strategy means that it's difficult to "go back" to a story line.

I noticed her repeatedly screenshotting her phone and asked what she was doing - she said she likes to re-read the stories and so she swipes through her gallery to satisfy this need.

So I built a simple wrapper around adb, built a plain C# WPF front end for the wrapper and passed through clicks and automated screenshot calls for her. So she plugs in her phone, fires up the app, and she can read her VNs on her PC and have screenshots saved on the PC for her.

I built a variety of other processing apps to solve other needs for managing these files.

There were some free-to-download apps that solved a lot of these problems but none in quite the right way, and a lot of them looked fairly sketchy.

I don't really have any intention of distributing the software I wrote because it's so specific to her needs, and at best I might throw it up somewhere so I have the source backed up, as every once in awhile she asks for something new to add to this program.