How do i upload an attachment with FF addon?

I have a premium account, I go to a secure note, then edit, then scroll down to attachment and click it, then hit browse. The file select dialogue pops up, i select a file and all that happens is the file select dialogue closes. I dont see any uploading and when i check the secure note im trying to upload to its attachment is empty?

Linux - Manjaro - KDE - firefox 61.0.1

This is a known bug in Firefox itself. Been that way for a long time.

You’ll have to use the web vault or desktop app.

Aye, i found i could do it fine on the vault. Quite a pity as this functionality was the main reason i just purchased a premium account :-/ Thx for the info.