A 503 error occurred when using the API.

On 2026-02-05 11:54:44, we use the Upload file version API (https://developer.box.com/reference/post-files-id-content). I got the below response: {"type":"error","status":503,"code":"unavailable","help_url":"http:\/\/developers.box.com\/docs\/#errors","message":"Service is temporarily unavailable","request_id":"r1l5zti9zii42z1x"} 

The file size is small (~1MB). I want to know more detail for the above error. Thank you.