Here are a few possible reasons and steps you can take to troubleshoot this issue:
Caching: Thumbnails are often cached for performance reasons. Sometimes, the old thumbnail may not refresh immediately due to caching. Try clearing your cache or refreshing the page to see if the new thumbnail appears. Browser or App Issue: If you're experiencing this in a web browser or a specific app, it could be a browser or app-related issue. Ensure that your browser or app is up to date, as updates often include bug fixes and improvements.
File Naming: Some platforms generate thumbnails based on the file name. If you're replacing a file but keeping the same name, the system might not recognize it as a new file. Try renaming the new file before uploading it.
Server-Side Issue: It's also possible that the issue is on the server-side of the platform you're using. In such cases, there's little you can do except contact the platform's support team and report the problem.
File Format: Ensure that the new photo or video is in a supported file format for the platform you're using. Some platforms might have limitations on which file formats are supported for generating thumbnails.
Metadata: Thumbnails can sometimes be generated based on the metadata embedded in the media file. Check if the new media file has updated or correct metadata.
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