Maybe the Zarchiver app could would better for you. You will need an app to extract rar first. Then install the apk. There should be a lucky.paradox folder in documents after that. And inside it is a game folder. That is where the archive.rpa file goes. Then transfer your saves and it should load. If there isn’t a save folder then start the game and a new save then it should automatically be created. You can also check this video out on how to do that:
Also a step by step guide here:
https://www.patreon.com/posts/android-master-82619463
Hopefully that helps and solves it