Hi, When you expot widget to your self-hosting, you must type the correct hosting URL. After exporting, you will get some files, and then you need to upload all files to your web hosting.
If you do any change in your project, you still need to re-upload the files to your web hosting. After that, you are able to see the change.
You can also refer to the following:
How to show the new widget correctly?
1. Export it as you used to.
2. Paste the new embedded code(from new online.html file) to what you want.
3. Clean the cache of the browser.