Hello there, thanks for the purchase!
To answer your question, android has a built in security feature that prevents it from running certain files above a 2 GB file size.
To play on mobile, you would need to download and configure a program called Joi Play that allows you to get around this limitation. Alternatively you can play via PC as you mentioned. Hope this helps.
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I can understand your frustration - unfortunately the problem isn't something I can actually fix. To answer a few of your questions though, I have patrons who use joiPlay, they tell me about their experiences and also how to use the app.
It was also through their efforts that I learned the real problem.
Games built in Ren'py 8.0+ aren't compatible with joiPlay. Whether this was purposeful or a mistake on Ren'py's part - I'm not sure. The reason games won't run normally once they hit a certain file size is also something beyond my control. Any non-certified (that is, a game slated for app store release) Android game with a file size of 2gb or more won't run on android phones - it's a built in security measure. Using joiPlay is one of the only way to circumvent that.
In short, the only way for this issue to be fixed is for A) Ren'py developers to acknowledge and fix it (if they can) or B) joi Play to release an update so that Ren'py 8+ version games are compatible. It's also worth noting that this issue isn't something unique to my work, many other games have been experiencing it as well. The only real solution is patience.
The irony is that i actually avoided updating to Ren'py 8+ because I wanted to avoid issues like this from the beginning. Clearly that didn't work out too well.
I think you're misunderstanding the situation a bit. I'm not withholding any knowledge, nor are my community members. Joi Play works fine for most games built in Renpy 7 or lower. Until Ren'py addresses this issue or joi Play does games built in Ren'py 8+ will continue to have this issue, there's nothing to be done short of playing on PC (if you're able).