In an effort to understand the installation and distribution process for Android apps that are not being distributed through Google Play Store, I generated an (unsigned) APK from Android Studio and then dropped it in the root directory of the SD card on my phone. When I do this, I can simply use File Manager to find the app on my SD card and then click it: the phone then asks me if I want to install the app. If I proceed, the app is installed and runs. ONCE. If I want to run it again, I have to go to File Manager again, find it on the SD card and install it again. That's fine as far as it goes but how do I install it on the desktop on the phone so that I only have to launch it as an already-installed app? None of the videos I've found touch on that topic.
I'm hoping you will NOT tell me that I can only install the app permanently if I obtain it from the Google Play Store :-)
The app I'm near finishing is only tended to be used by me and two other work colleagues and is of no interest or relevance to anyone else; this isn't a game or utility that would be of general interest to everyone. I'm assuming that the Google Play Store is only meant for things that have a large potential audience.
If I can make my app go on to the desktop of my co-workers phones so that they don't have to reinstall it each time, can someone please tell me how to do so or point me to an article/video that explains the procedure?