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welcome to AF!!!!!!!This last post looks like the info I have been looking for...is it still current and applicable to updating my t520 now that it seems there are apps that do not support kitkat? This would also be my first attempt at something of this magnitude.
MH1
I checked out the link above. That's my problem for sure. I played around some more with the settings, I got it to work, but I'm not sure what I did to get it to work.maybe this article might help you:
https://www.howtogeek.com/271519/how-to-fix-the-screen-overlay-detected-error-on-android/
basically it is settings>apps>advanced>special app access>display over apps. is this where you see that the apps are greyed out so there is no way to toggle it on or off?
eah, I think that's a bit of an oversight on the forum's part - I suspect it's because the code blocks are really only used in the dev sub-forum, but maybe it could be added in a sticky? (I don't remember ever reading one with that note)


I'm interpreting this quite differently from @svim, i.e., that you're just wanting to know how to create an APK from an existing app. If that's not correct, skip the rest of this!Just wondering...
How does one download their own self made APK's?
Like, say if I have a game or even Playstore (and the other services)... can I make my own APKs and give out?
Just wondering where these clever people go the linked APK's from?

It's an 'app backup' feature in them. (This has saved my ass in the past.) Note, though, that I basically only use paid apps, and wouldn't consider sharing their APKs with anyone.
So instead of learning how to do it myself, I let apps I paid for do it for me.