Can TestFlight's "What to test" field be edited before the build is submitted?

Ok so this is what you gotta do:

1. Turn off TestFlight Beta Testing
2. Upload your build
3. Add your notes
4. Turn on TestFlight Beta Testing

Once you turn it back on, your testers should get a notification WITH the build notes. Not sure why this wasn't working, but there it is.

Good news, now the great Apple allows us to edit "what to test" easily:

1. Open iTunes Connect
2. Select your App, click Tab TestFlight
3. Click iOS -> [select one of your builds] -> Test Details
4. Now you are able to edit What to test as follows

If you do what User9527 said BEFORE you do the export compliance, it will show your test notes in the email and in test flight. So after your build uploads, do this: Open iTunes Connect Select your App, click Tab TestFlight Click iOS -> [select one of your builds] -> Test Details Now you are able to edit What to test as follows Then save it. Then do your export compliance. Then the email goes out and you are all set!!