[Add exported filename to slices]

Bumping this again as a new user coming over from PS. A file name variable is a no-brainer. I would also like a layer index variable formatted to two digits (e.g., 01, 02, 03, etc.).

So without any effort on my part renaming layers, I could get slices like...

MyImage_01.png
MyImage_02.png
MyImage_03.png
MyImage_04.png
MyImage_05.png
MyImage_06.png
MyImage_07.png
MyImage_08.png
MyImage_09.png
MyImage_10.png
MyImage_11.png
MyImage_12.png
MyImage_13.png
MyImage_14.png
MyImage_15.png
MyImage_16.png

Presently, I must manually rename 16 layers to achieve this result.