Restarting the File Explorer process and clearing the cache usually fixes most issues.

Keep in mind that if you use Discord on multiple devices they'll each have their own local cache, here's how.

Clearing the cache of your computer can improve its performance, and here's how you can do it if you're using a Windows 11 operating system.

It is called media cache on Premiere Pro. The cache is stored in the media cache folder or Premiere Pro along with the media cache database files which store links to each media cache file.