If a newly uploaded library image appears briefly and then disappears, or displays differently across various clients, it is likely a caching issue. This behavior is common for servers utilizing a Content Delivery Network (CDN).
Emby handles image filenames differently depending on the library type:
- Collection Posters do not have this problem as Emby assigns a unique, randomized filename for every upload. This automatically forces clients and CDNs to fetch the fresh image.
- Library Images generally retain a static identifier. Because the URL doesn't change when you update the image, your CDN assumes the file is the same and continues serving the stale, cached version.
The Solution
- Just wait: The updated image will eventually appear on its own once the CDN's cache naturally expires.
- Purge the Cache: If you want the new image to appear immediately, log into your CDN provider's dashboard and manually clear the cache.