Regarding the new builder.
I tried the new app builder and I found several issues.
The first one is the almost all the apps fail to build. I tried many things and I am sure I didn't forget anything like (images, links, package name, app version, icon ) but nothing worked. Even the one that successfully builds it doesn't work on the phone or the emulator, it just crashes on startup.
The second issue is the app size. I only uploaded like 6 audio tracks with 20MB and the app size doubled to be more than 45MB in size. You already know that Google only allows apps less than 100MB to be uploaded.
I suggest you add something like .aab to help us with the app size problem.