"location constraint" error on some regions

If you create a bucket in some regions then you get the below error when trying to access the file:

`
IllegalLocationConstraintException

The af-south-1 location constraint is incompatible for the region specific endpoint this request was sent to.

AA9313B3EA6564D2

GfLxHF3hvL+6o/ZCvkK1boSjj1Y+6m1/T1CqcsBAe4L9kB9m+eipqAiiin60ChdXXjwXR7TIp1Y=

`

Example for a bucket in "af-south-1" the S3 URL created is

https://{bucket}.s3.af-south-1.amazonaws.com/wordpressmedia/uploads/2020/05/test.jpg

but the plugin generates:

https://{bucket}.s3.amazonaws.com/wordpressmedia/uploads/2020/05/test-1024x191.jpg

on line 140 of class-s3-uploads.php the generated URL is:
`return apply_filters( 's3_uploads_bucket_url', 'https://' . $bucket . '.s3.amazonaws.com' . $path );`

perhaps it should be :

`
public function get_s3_url() {
if ( $this->bucket_url ) {
return $this->bucket_url;
}

$bucket = strtok( $this->bucket, '/' );
$path = substr( $this->bucket, strlen( $bucket ) );
$region = $this->region;

return apply_filters( 's3_uploads_bucket_url', 'https://' . $bucket . '.s3.'. $region .'.amazonaws.com' . $path );
}
`

Start in class-s3-uploads.php at line 140 and inspect get_s3_url(), especially how the bucket, path, and region are used. Reproduce the af-south-1 example and verify that generated URLs use the region-specific S3 endpoint while preserving the existing bucket path and filter behavior.

Written by the indexing model from the issue text.