I've been using SHIFT+TAB from within the message body to throw focus to the Attachments for "forever."  You can then right/left arrow through the attachments present.  If you hit either end of the list you'll sit there if you try to move any further in the same direction.

Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

          ~ Saul Bellow, To Jerusalem and Back



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