When sending and email, and attaching a file from a cloud storage (Google Drive, OneDrive), these files are added to the "Attachments" view.

It is then impossible to delete such attachments. Even if the original sent email (which contains the attachment) is deleted, the attachment stays behind orphaned and there is no way to delete it.

Or is there a way to delete these attachments? It's obviously a problem. Eventually these attachments will fill up the allocated space and user will not be able to reduce this space but more importantly, it creates privacy concerns, since I'm not really in control of what stays behind on your servers after I though I deleted my emails.

How can I delete the attachments?

Regards,
Ondrej