RedShift COPY Command on Sub-set of Files

I'm trying to run the COPY command to copy a sub-set of my s3 bucket's objects into Redshift.

copy my_table
FROM 's3://my_bucket/1234*'
credentials 'aws_access_key_id=<REMOVED>;aws_secret_access_key=<REMOVED>’ 
json 'http://s3my_bucket/json_path.json'

However, I'm getting the following error:

Problem reading manifest file - S3ServiceException:The bucket you are attempting to access must be addressed using the specified endpoint

I looked up this error "... using the specified endpoint" - the AWS docs say to put the bucket + redshift in the same region.

My S3 bucket is located in US Standard. According to this answer, "US Standard" equates to us-east-1.

And the Redshift cluster's region is us-east-1a.

Although I'm not sure of the cause of this problem, I'm curious if I need to use a manifest rather than only copy s3 bucket objects (from my_bucket) that begin with 1234.

What's my issue here?