When you list a school on the primary your account will generate a request for the transcript from that school. This occurs for every single school you list. When the transcript arrives and AMCAS loads it into your application (which can happen either before or after you submit your app) the request is complete.
After you submit your application, the AMCAS processing system will check to make sure every transcript request is complete. If it is, you enter the verification line. And if not, then it will wait until the transcripts are sent it and loaded.
I don’t think you can add a transcript to your file after submitting the app because you have to generate a transcript request in order for your transcript to be used during verification. And you can’t generate transcript requests post-submission iirc.
But I want to ask
@gonnif about filling out the app itself because I’m pretty sure you can fill in those courses as “future/current” and the verifiers will go ahead and fill in those grades ONLY IF the transcript that completed the transcript request contains those grades.