From admin perspective I do not extend permissions to permanently delete emails to end users, since often they ask me to restore thing deleted in error or move to trash by spam filtering. All users have permission to delete/mark as spam, however, ...
Print Conversation function prints/coverts to PDF in full resolution as opposed to a "preview" of included attachments.
Currently only when using the Print Conversation feature (Conversation 3 dot menu > Print) , it also includes the attachments inside the print/convert to PDF. Unfortunately, depending on the document, these "previews" of the attachment are down...