I've finally completed building my own first flutter app, a lot thanks to SO. But I've still got an issue about testing my flutter apk in others' devices. So, finally i got 'app-release.apk', 'app.apk' and few more apk-related files. So excited, I sent those files to my friends, but friends told me that the app is well downloaded but not able to open it. So here's the question! Is there any additional essential commands to successfully open the apk file on real android device? If so, is there really no way to install and successfully open and use .apk or .aab flutter app in my friends' android device? I want to test my app in friends' device BEFORE google's review is done! Thank you in advance [: