Hi dloeffort Please try Thunderbird Troubleshoot Mode: https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird If that fixes the issue please let us know! If it doesn't fix it: Please provide the following troubleshooting details to help us help you: 1. A screenshot of "Email attachment icon is small dot with two curved brackets on each side, no paper clip" 2. Please also let us know what version of Thunderbird you are using, your operating system e.g. Windows 11 and your email provider e.g. gmail, what 3rd party software like add-ons, anti-virus or firewalls you are using Cheers! ...Roland