as far as I know, when you click on send for analysis, it does nothing and doesn't send to avast yet
you have to perform a signature update or wait for avast to autoupdate itself, then, the file will be submitted
you can see the process of submitting the file if you access Avast old UI -> update
After submission, avast will not distract you with any email or any result. They work silently
it's quite similar to many other vendors
Some vendors like Kaspersky and Sophos actually reply to our malware submission if you submit via their websites. They reply by email and tell you the result of analysis
Avast, microsoft don't reply and work silently