Thumbnails on s3 bucket not displaying #23

On MODX 2.8.3 with AWS S3 Media Source Extra installed thumbnails are not displaying for images of any size in the bucket. A small window does pop up displaying a 404 icon. So it makes the file but can't find it to display.

I have contacted MODX support about this. Here's what he last said:

The error is stating that bucket does not yet exist. By the looks of your code, the bucket name is not correct, which is why a file cannot be found.

<Code>NoSuchBucket</Code>
<Message>The specified bucket does not exist</Message>
<BucketName>bmcm-aws</BucketName>

I have confirmed that the bucket name is correctly entered in Media Source.

Also, note that the BucketName in the above code is actually the S3 account name which only appears as part of the URL for the Amazon S3 instance in the Media Source setup.

Any ideas? . . .