Page 67 - Photoshop for Lightroom Users – Scott Kelby 2nd Edition

Step Seven:
At the bottom of the dialog, you can choose the name applied to photos you send over to Photoshop for editing. You have pretty much the same naming
choices as you do in Lightroom’s regular Import window, where hopefully you chose some sort of custom name because the default name of “IMG_0002”
is pretty much meaningless. Here’s what I recommend for your External Editing preferences: from the Template pop-up menu, choose Filename first, then
go under that same menu again and choose Edit (as shown here).