CodyNorris

@VeeBee I too was having this issue. If you click "add section" and then scroll to video, and choose one of the block options, it then allows you to link a Vimeo video and add a custom thumbnail. Trying to add a video from the + on the side bar will only allow custom thumbnails for video directly uploaded to SquareSpace. Add a section and then add a video block and try to link your Vimeo video and custom thumbnail that way. My Vimeo custom thumbnail comes out clear this way though!