Flutter's iOS build is updated to TestFlight but disappearing after "processing" status in Activity session

Question

After creating the iOS build from my flutter project, I archived and uploaded it to App Store Connect via Xcode and everything went fine, no erros and no warnings.

When I went to the "Activities" section in App Store Connect, the app was in "processing" status. Before I Control+R the page

After I Control+R the page, the app was gone and it was even suggesting me the upload tools

I tried again after increasing the build version numbers and everything, but I am still having the same problem.

$flutter doctor is fine, debug is also fine (not showing any other difference between my other already uploaded flutter project and I haven't found anything like this here yet

Solution

I first did

$flutter clean

then

$flutter build ios

and added +1 to the project version