Thunderbird attachment from Samba share won't send

[EAB]

Ubuntu 14.04.3 - Thunderbird 38.3.0

Samba shares are mounted and accessible via Files file manager.

Drag-n-Drop file from mounted Samba share into new Email attachments area works.

Cannot send email due to:

"Sending of the message failed.
There was an error attaching smb://server/path/to/file. Please check that you have access to the file."

This bug report about what seems to be the same issue was opened in 2007 > https://bugs.launchpad.net/ubuntu/+source/mozilla-thunderbird/+bug/105088
In April 2014 it was marked as "Fix released" - not sure what that means ... because it's not working here.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Roberto (roberto-colnaghi)]

We have the same problem here. We can attach files which are on Samba common shares, but not from Samba homes.

[Roberto (roberto-colnaghi)]

Today we upgraded some packages (the kernel, X server, dpkg, virtualbox). After reboot, Thunderbird's bug was gone. The upgraded packages seem unrelated, anyway.

[Berte (berte)]

Still occurring here since a long time. Now using Thunderbird 38.8 on Ubuntu 16.04 x64.
You can mail me if I can be of any help.

[M (nefilims)]

Also happens to me with TB 52 on Linux Mint Cinnamon 17.3.

[Berte (berte)]

Seems to work correctly for me now on Thunderbird 52.9.1 (64-bit) and Ubuntu 18.04.1 (Gnome 3.28.2) all updates applied to date. Samba server is running smb protocol v3.

[EAB (adair-boder)]

Yes, with TB 52.9.1 64bit under Ubuntu 18.04 The issue seems to be resolved.

[Paul White (paulw2u)]

Re comments #3,6 & 7, I'm marking this as being fixed.