@conchigil Thank you for the update. If your media is not loading you can check for any potential conflicts between Web Stories and another plugin on your site. To identify if a plugin is causing the issue, can you please perform the following troubleshooting steps?
1. Install and activate the Health Check & Troubleshooting plugin
2. In WordPress admin, go to Plugins and click Troubleshoot to enable Troubleshooting Mode. This mode disables active plugins and switches to a default theme safely; this will not affect what your site visitors see, as it only changes the look and feel of your website for logged-in administrators.
3. On the Troubleshooting Mode page, under Web Stories, click Enable while troubleshooting
4. Go into the Web Stories Editor and see if you’re still experiencing slowness
5. If slowness does not occur while in Troubleshooting Mode, re-enable your site’s plugins one-by-one by clicking Enable while Troubleshooting for each and checking the story again. This can help us pinpoint if a particular plugin or theme is causing the issue.
It’s also good to clear any server-side or plugin caching on a private/incognito browser to rule out any caching conflicts.