LibreOffice Flatpak Doesn't Send Files

Libreoffice flatpack; Thunderbird DEB.

Can’t send LO files. Email is generated, file is not attached.

Please advise.

See:

LibreOffice needs to use the Email portal for this to work.

I have no idea what that means.

I think basically (from the link provided) it refers to a bug still yet to be addressed by the GitHub dev’s (responsible for fixing the issue) so there is no basic user action available.
Where I have encountered similar issues and the file is not seemingly attached, I manually add it (Useful hint: adding the word “attachment” in to the body of your email often triggers a reminder).

Yeah, that’s what I do - I guess its a conflict between the flatpak and the deb.