Recurring Issue with Attachment Button in Thunderbird Desktop
Dear Support Team,
I am facing a recurring issue with the Attachment button in the Thunderbird Desktop application for the past few days.
When I click the Attachment button while composing an email, it does not respond or open the file selection window. However, I am able to attach files successfully by using drag and drop.
After some troubleshooting, I found that deleting the mail.compose.attach.dir preference from the Thunderbird Config Editor resolves the issue temporarily. Once I delete this preference, the Attachment button starts working normally again.
However, after some time, the same issue reappears, and I have to repeat the process of deleting mail.compose.attach.dir from the Config Editor.
Could you please advise on a permanent solution to prevent this issue from recurring? I would appreciate it if you could also let me know whether this is a known Thunderbird issue and if there is any recommended configuration change, update, or fix available.
Thank you for your assistance.
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This is a recently discovered bug. The symptom is that if you previously attached a file, but the previous folder now no longer exists because it was deleted or renamed, when you later try to attach a file using the Write window's "Attach" button, it will silently fail. That is, clicking the button will appear to do nothing. The bug should be fixed in the next release.
In the meantime, a workaround is to drag-and-drop the file onto the Write window, as you discovered.
Or, if you don't mind changing Thunderbird's Advanced Settings:
- In <Settings | General | Config Editor> search for: "mail.compose.attach.dir".
- The value (path) here must be changed to one that is still available (for example C:\).
- Close and exit Thunderbird, then restart it (this step might not be necessary.)