Immediately after clicking download button to get the file, the user gets an error message "Link Expired".
(Not because he turns to download such link later for hours, but it happens at first.)
The site is also using NGINX.
If you're running several file servers - make sure to sync time on all servers (including the main-server).
- This means the main-server and all file-servers must have EXACT time.
Main server: 16:00PM
File Server 1: 16:00PM
File Server 2: 16:00PM