Top best answers to the question «Why wont youtube thumbnail show on facebook»
The reason behind it is that Facebook loads the data from YouTube once it's shared on the platform for the first time. So if you share the video through Messenger before all the data is ready, it's going to be missing part of it, including the thumbnail.
1 other answer
My customized thumbnail won't show up on facebook and i don't know how to do that I'm new here. Click to expand... To take a screenshot of the problem, press the print screen button on your keyboard, then paste the image into Paint (or something else), and save it. I don't know how to help with your problem, sorry.