I'm a subscriber to the Photography Plan. I have rebooted my Win10 PC and opened Lightroom CC Classic from Creative Cloud. When I highlight an image in Library and go to File> Email Photo, the image does NOT appear in the attached file field. A student of mine with a PC is having the same problem. I also have a mac and do not have any problems seeing the image in the attached files field. It sounds like a Adobe/PC coding problem. Hope you have a solution.