On a LilacTutor system, I created a video unit and inserted one of my videos. I then decided I didn’t like the YouTube thumbnail, so I went and changed it on YouTube and saved the change. I then went back to Open edX, and deleted the video, and re-inserted the video with the same URL. However the old thumbnail continued to show up. I believe this means it’s caching it based on the URL, instead of re-downloading the thumbnail from YouTube. How can I evict the incorrect thumbnail from the cache?
(P.s. I just accidentally did this again so I know it’s definitely reproducible.)