What is the possible cause for the issue?
The referenced Amazon S3 bucket is in another region.
The images must be stored in the same Amazon S3 bucket.
Port 80 must be opened on the security group in which the Amazon S3 bucket is located.
Cross Origin Resource Sharing must be enabled on the Amazon S3 bucket.
Explanations:
The region of the referenced Amazon S3 bucket does not affect the ability to download images if they are publicly accessible. S3 handles cross-region requests without issues, provided the correct permissions are set.
The images do not need to be stored in the same S3 bucket. Cross-bucket requests are allowed, as long as the permissions are correctly set on the source bucket.
Amazon S3 does not use security groups. Instead, access is controlled through bucket policies or object ACLs. Port 80 is not relevant for S3 object access, as S3 endpoints use HTTP or HTTPS over standard ports.
Cross-Origin Resource Sharing (CORS) must be enabled on the Amazon S3 bucket when resources (like images) are accessed from a different domain. Without CORS configuration, browsers will block the images due to security policies.
It appears that the answer is:
Cross Origin Resource Sharing must be enabled on the Amazon S3 bucket.