Sorry, failed to upload file: No 'Access-Control-Allow-Origin' header

[rileycrane]

While developing locally, I continue to run into a pop up Sorry, failed to upload file. The console shows the issue is:

XMLHttpRequest cannot load https://s3-us-west-2.amazonaws.com/BUCKETNAME. 
Response to preflight request doesn't pass access control check: 
No 'Access-Control-Allow-Origin' header is present on the requested resource. 
Origin 'http://localhost:8000' is therefore not allowed access.

Any advice on how to proceed? I've updated the CORS policy in S3 to be

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>PUT</AllowedMethod>
        <AllowedMethod>POST</AllowedMethod>
        <AllowedMethod>DELETE</AllowedMethod>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

[rileycrane]

changing region to S3DIRECT_REGION = 'us-east-1' fixed the issue.

[akalinmehmet]

To prevent misunderstandings for ones facing with this error, S3DIRECT_REGION must be set to your S3 Bucket's region not staticely 'us-east-1'.

For example, my S3 Bucket stays on 'US-WEST-2' so this value is, for me,
S3_DIRECT_REGION = 'us-west-2'