I have shared two of my work email shared folders with reception staff at my business. Through mail groups, they get new mail from a shared address flowing into their business email account inboxes. I thought by sharing the various shared folders with them (See sreenshot attached), they'd be able to file emails according to 'type' in the shared folder. However, they are unable to drag and drop anything into them. It just doesn't seem to be an option. They are able to view what is in my shared folder.

Please help, this functionality is an absolute business requirement.