Форум поддержки Thunderbird

I use Thunderboard on a PC and googlemail on an iPad. On TB, there are 2 tabs - Sent and Sent Mail. Their contents differ but should be integrated under one name but messages sent from the iPad land in Sent Mail, not Sent.

I thought this TB and Gmail could be synchronised? How??

Trying to add an Gmail account on Thunderbird. My email address and password are correct. What to do? Using Surface Pro 8, Windows 11. I can access Gmail account directly but something happens when I try to add it to Thunderbird. My other email accounts, outlook.com & comcast.net installed without problem.