Uploading applications to the Play Market?

Question

Google Play

Good afternoon! Tell me how to properly upload the application to the Play Store.
I created internal testing, defined a list of testers, and for the first time everything worked for me, people installed it. Then I wanted to upload updates, uploaded a new build, as I understood it was necessary to create a version for internal testing again, everything was created for me and after a couple of hours I received a notification that it had been published, but the old version was still in the market. I tried to do the same a couple of times in the end, in general, something was lost. The version seems to be there and published, but it does not open in the market.
Tell me how to upload correctly?
I thought that I would just add a new version and the user will be notified that it needs to be updated ...