CoolMoo5
I Love YTtalk
I made a new channel and I put first video up. I wanted the video to be good and be seen by people. So I changed the custom thumbnail a couple hours after it was being uploaded. I noticed it takes over 48 hours for the thumbnail to be available on all devices. If go on certain browsers the change might be there but on other devices it might not be. I changed the thumbnail again yesterday morning and it is still not available on all devices. The only place where the thumbnail change is available instantly is under my video manager. This is interesting. Since this is my first video, I figured it would be fine if I played around with my thumbnail. But I guess for everyone else, my advice is to change your thumbnail while the video is uploading and don't change it again. Just my thoughts. It is really annoying because right now my video has 3 different thumbnails depending on where I look for it.