Hi @GrandmaLilly, sorry to hear you're having problems with this. When uploading your course image there are a few things that are taken into consideration, you can read more about the quality guidelines for course images here. Besides the minimum required dimensions being 750 x 422px, the file format must be .jpg, .jpeg, .gif, .bmp or .png. If your image meets the criteria, you may want to try the following troubleshooting steps:
1. Try a new browser
2. Make sure your computer’s time zone is correct
3. See if you have any plugins turned on and try to turn these off
4. Clear cookies and refresh the page (make sure to save any changes you've made to your course)
If you're still having issues after trying this, please reach out to instructorsupport@udemy.com with the following info:
Bella Almeida
Udemy Community
