Hi there. The older version of the app had an experimental and pretty unpolished export function, but it should work after a fashion. This is what the readme says:
1. Press the "Save to disk" option (no message will popup fyi)
2. To find the .save, you need to go access the folder /Android/data/app.courseoftemptation.lewd
3. You need a special file manager, x-plore from Play Store does the job well. As long as your file manager can request for SPECIAL PERMISSION access, you can use any type.