Rated 1 out of 5 stars
It does not work on Linux (elementary OS) with Thunderbird 60.8.0 (64-bit).
It attaches only a text file that contains the address of the copied file.
This may be an issue with the file manager (see https://github.com/mganss/AttachFromClipboard/issues/2 ). Please report which file manager you are using at the issue thread on GitHub. Thanks.