If it's emailed mdd, does the folder get zipped. Also, if a zipped or .rar or .tar.gz (i.e. compressed mdd folder) gets sent, when opened in Matcha, it should automatically be unzipped and ready to edit in Matcha.
Also, when emailing documents (once embedding is added), allow users to separately attach any embedded pictures and files.
P.S. if you some of these tangents as new topics for keeping track of new features, let me know.