Hey @davidcarterphd! It may be a few extra steps, but I might try to take a screen shot of the frame in the video that you want to use for the thumbnail. Then post that image in the RCE and link it to the video. You are basically manually making your thumbnail this way, but it would give you the opportunity to have a thumbnail if you can not figure out another way of creating it automatically. I know this would be difficult for many videos, but I thought I would share this as an option.