How to Update AWS Access Key and Secret Key for Synology Cloud Sync

I have a Synology NAS and I'm using Cloud Sync to send data to an S3 bucket. I want to rotate the IAM user's Access Key and Secret Key and update that in the Cloud Sync app, but there doesn't seem to be a way to edit the connection in Cloud Sync.

I see "Unlink" in Cloud Sync, but I'm not sure what that does exactly. Does it remove the connection and I'll have to "resync" everything to S3? The documentation says, "Unlink: Remove the connection of your Synology NAS and the public cloud service."

Anyone have experience with this?