Timeout reached uploading images

When uploading 2GB image via Sunstone to a GlusterFS image repository (though this also happens with other local LUN image repos as well) getting a timeout error effectively indicating that the operation timed out.

Eventually, the copy finishes and I get this, if you are patient and give it enough time:

Mon Nov 11 13:06:23 2019 [Z0][ImM][I]: Image (10) copied and ready to use.

But via the UI, the message is misleading that things have failed. Looks like a timeout setting? Where can I increase this timeout and which value controls it?