The default video player will differ widely across Android devices (in a way that iOS devices don’t) so could you let us know which device/android version you are using?
Thanks for answering, I tried my app on Xiaomi Redmi Note 9 Pro, Google Pixel 5 and Xiaomi Mi 11 Pro. And not on one of these devices, the video does not open in full screen.
Yes, I also tried to turn the device over, it still does not help. On the iPhone, it opens quietly, immediately to the full screen. And on Android, it just runs in this little window and doesn’t want to open in full screen. Here is a link to the application (https://play.google.com/store/apps/details?id=com.gmail.papikosha.dogcity), I can explain how to get the error if you have an android device?