Good morning @PLee ,
Thank you for the additional information, this is helpful. The region that corresponds with "us-gov-east-1" is AWS GovCloud (Us-Gov-East) in the dropdown, so it looks like you've tried the correct one.
Could you please share the error message you get when you try and create the connection? That could help us identify what is causing the issue.
Additionally, please note that in order to connect to Amazon S3, the credentials you specify must have the following permissions associated with them: "s3:GetBucketAcl", "s3:GetObject", "s3:ListBucket".
I suggest contacting your Amazon S3 admin and confirming your credentials have at least those permissions, and that the provided credentials are correct.
If the issue still persists, I'll provide some suggested next steps.
Thank you for your time!
Bethany