Iframely video thumbnail doesn't load on posting

I tried fixing this issue in the past without much success. I have Iframely set up for my test site. I post an example video from YouTube. When the update posts, the video thumbnail won't load unless you click the three dots on the bottom right to inadvertently trigger a load within the post window. I have attached a step-by-step series of screenshots. Does anyone know how to get the video thumbnail to load as soon as the update is posted?