There's a merged pull request on the mblaze repository

Attach all files when forwarding in raw mode
https://github.com/leahneukirchen/mblaze/pull/252

Description:
I want to use forwarding with raw messages because it's just easier to work with from the point of view of receivers. The problem is that when "flattening" the message, attachments are lost. This PR extracts them in a temporary folder and adds them to the message to be sent