Please show screenshots of the Syncthing Web GUI on both sides. On Android, you can access it through a button in the left slide-out menu. Please make sure that the folder is unfolded with all important information visible, and also that any errors that you’ve encountered are displayed on the screen too.
Also, what do you mean by “stuck” specifically?
Looking again at it, that’s a lot of files. Which version of Android are you running? Syncing that many files on Android 10 and newer can be very slow, i.e. literally take days. Scanning can also be very time consuming. I’ve done some testing in relation to this problem in https://forum.syncthing.net/t/how-to-deal-with-abysmal-i-o-performance-on-android-10 if you’re interested.