Doxie tries to feed, but the document doesn't start moving.

If Doxie doesn't grab your paper after pressing Scan, your stack isn't quite in the paper feeder far enough for Doxie to grab your sheet. Just lightly tap the top of the page after you hit Scan to get the feeding started.

This is rare, but can happen if the sheet or stack just isn't inserted enough, or if you're inserting particularly thick paper like cardstock.

If that doesn't help: