Unable to add Email file such as *.eml. Especially, this eml file has an attachment file

Unable to add Email file such as *.eml. Especially, this eml file has an attachment file.

Seems quite similar to the issue reported on our bug tracker: https://github.com/cryptomator/cryptomator/issues/848

The mentioned issue is closed with Cryptomator 1.4.7. Is this still a thing for you?