Rated 4 out of 5 stars

Nice, but needs the ability to remove or disconnect attachments from a message. This is possible without the Conversations extension, and should also be possible with Conversations.

(On my system (Linux Mint LDME 6) clicking or right-clicking on the three dots next to the attachment does not give the option of removing or disconnecting the attachment)

This review is for a previous version of the add-on (4.1.6). 

It is already possible to remove/disconnect attachments from a message. You can use the three dot menu next to the attachment display to do this (beside the download and open icons)