As a workaround I've applied the following which works but I was hoping for a cleaner solution.

Code:
SET counter=0
FOR /r "e:\test\myfiles\" %%X IN (*.jpg) DO (set /a counter+=1)
FOR /r "e:\test\myfiles\" %%X IN (*.pdf) DO (set /a counter+=1)

ECHO Copied %counter% file(s)