Hi, thanks for the tip. I had some issues with my thumbnail and took some time to sort out. I used https://postimage.org as suggested. The thumbnail still did not load but then I was able to rename the images that was uploaded straight from the browser without having to reupload.
The key is you must make sure that there are no funny/special caracters in the image name as this will be in your url too. After renaming the images and updating the image urls in my post the thumbnail loaded.
Thanks! I'm super grateful