uploading remote config vars from other environment

Well we recently started using remote config and we kept ignoring this issue for a while now but I am questioning why no one else seems to have this issue after weeks of this one being in existence for us at least.

We have two environments, "release" and "staging". All of our default configs are in "release" and now we download the configs from the UI and then upload them into "staging". But when we click "save" it just throws an error
"services.unity.com/api/remote-config/v1/projects/xxxxxx/configs/xxxxxx:1 Failed to load resource: the server responded with a status of 404 ()"

using Chrome on latest Win10

Can you provide detailed steps to reproduce? Screenshots would help too.