Is the submission to the group of testers of a new build automatic?

hi

I followed the tutorial step by step to register my app for testflight, it works fine after a few tweaks
i send an update it seems simpler we must change the version of the app on apple store connect and return to thunkable to publish this update
i’m losing my latin

I was told by Thunkable Support that I need to create a new certificate for each build for TestFlight. So I think that means that a new provisioning profile also has to be generated. I don’t remember having to do that for updates in the past so maybe something has changed.