I'm getting an error on file uploads saying the Server is busy.

[john.abbey]

I'm trying to upload a larger file (120MB).  My site file size limits are well above that, however, the file fails to upload with a "server busy" indicator.

[g]

In most cases when the limit on Confluence is bigger then one of the files, something else is a problem, like a timeout limit on reverse proxy or file upload limit on some smart firewall or reverse proxy again.

I would suggest testing the issue without the reverse proxy by bypassing it with adding a new connector and using it. If the problem is gone, check the configuration of the proxy.

If this does not help, It would be also beneficial to provide us with the screenshot of the error message and HAR file once you do it.

Cheers!