Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App

Thunderbird for Android

App version

8.2

Where did you get the app from?

Google Play

Android version

11

Device model

xiaomi 11 lite 5g ne

Steps to reproduce

1. compose a new email
2. send it
3. check sent email
4. it is there
5. check for new email, by synchronizing the app with email service
6. check sent email box again
7. sent email disappeared!
8. Image
   
   

Expected behavior

It should be stored in the "sent folder", in both the android, and also in the web client of the "freemail" "sent box" but none of them can be find

Actual behavior

The sent email disappears from the sent box, after synchronization, and did not upload to the web client's sent folder either.

However, if I send email from the web client, this appears in the sent folder of the android app
It is funny that the exported file type (k9s) does not allow to upload... :) how to send it?

Logs