- Go to Setup > Trusted URLs
- Create a new trusted URL
- Add https://*.svc.ms in URL
- Make sure img-src checkbox is selected
Once this is added, your thumbnails should start working correctly. See image below for reference.
Thumbnails not working in LWC
This usually happens because certain URLs (which are used to fetch thumbnails) are not added in the trusted URLs. To resolve this issue, follow the steps -