How do I export an Android app to Itch.io?

I used to have some mobile games on the Google Play Store. Recently Google decided to remove all my games and my account due to me not being 18 yet. So now I want to reupload those games to itch.io to preserve them and keep them playable. How do I export a downloadable Android file to itch.io?

I have tried to use the signed release APK, and after downloading it on my phone it does prompt me to install the game, but after I click OK it then says "App not installed as package appears to be invalid". How do I fix this?

It's probably a question better asked to itch.io themselves - but as far as I know, Android devices deliberately make it difficult to install apps from anywhere other than its own app store for security reasons, so it'll probably be difficult whatever you do. It might be a lot easier just to do a web export.

I found the issue, since I already add the previous files from Google Play before they were removed, my phone didn't like updating the app with files from a different source. Simply deleting the old files fixed the problem and I can install the new migrated versions now.