Mail > Save attachment not saving the attachments because attachment Name as special character i.e colon :

As mentioned the problem is the empty name

In such case we can think about:

  • sorting it out for manually handling
  • renaming the attachment with a default name / repair name

You mentioned:

But we can do:
Assign Activity:
myMailCopy = myMailVar.Copy

and then we can rename the myMailCopy Attachments Names when we have detected an invalid/empty name