Hard to tell what the issue is from your screenshot, but here’s how to save attachments:
Use “Get Outlook Mail Messages” activity (use Filter property to only get mail following a specific rule) and output to variable of List[Mail Message]
For Each Item in List[Mail Message]
Use activity “Save Attachments” with Message property set to Item
This will save all attachments of each email retrieved with “Get Outlook Mail Messages”
If you want to retrieve only specific attachments from each mail retrieved, set the Filter property in “Save Attachments” activity.