Hi @edmondpogi
Sorry for the trouble. There could be several reasons why the thumbnail images are not appearing on your WordPress site. Here are a few possible causes and ways to troubleshoot them:
1. Incorrect image file path: Make sure that the image file path specified in your post is correct and that the image file exists in the specified location.
2. Plugin conflict: If you are using any plugins that modify how images are displayed on your site, they may be causing the issue. Try deactivating all plugins and see if the issue persists. If the issue is resolved, reactivate the plugins one by one to identify the plugin causing the issue.
3. Theme conflict: Your theme may also be causing the issue. Try switching to a default WordPress theme (e.g., Twenty Twenty) and see if the issue persists. If the issue is resolved, the issue may be with your current theme.
4. Image size: Make sure that the images you use for the thumbnails are the correct size. If the images are too large, they may not display properly.
5. Server issue: If none of the above solutions work, there may be an issue with your server or hosting environment. In this case, you may need to contact your hosting provider for further assistance.
I hope this helps! Let me know if you have any other questions.