Outlook VBA, download attachments from multiple selected emails, then Mark Completed

I know there's a lot of variations of this out there: I'm trying to select multiple emails, then click a quick access button to download the emails' attachments into a designated folder. At the end, I want to change the Follow Up state to "Mark Complete" (the checkmark) to the selected emails.

Solution "Save Attachments to the Hard Drive" from Slipstick doesn't seem to work for me. I select emails and click, nothing happens.

mAttachmentSaver.zip downloads great, but the code is visually really busy, so I didn't know how to add the part about changing Follow Up state. (I believe it has something to do with "olMarkComplete".) Is there a way to simplify mAttachmentSaver while adding the Follow Up part at the end?

Thank you.