I use a program called simple-scan, it works great! I highly recommend giving it a try. It is packaged and available through Debian Main repo.
I've tried that before, and I didn't think it worked for my printer.
But, now that all else is working, I tried it again and saw I probably wasn't using the menus properly. and it works! I was able to scan two-sided from my ADF and save to my files system and print it two-sided. I can do the same thing in color, too.
Now I can do it all.
Thank you Timothy!
-Tom