I've made a new image to replace my current thumbnail, however even If I edit it before the original thumbnail. It doesn't update the thread. I'm I stuck or is there a work around it?
I'm not entirely sure what you're asking here. Do you mean, you're trying to edit a post in a thread you made, re-upload a picture, and save it, but it's not saving it?
If that's the case, it's best just to go to the Contact The Staff thread and ask them if they can fix it.