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There could be several reasons why Laravel is unable to upload images to S3 despite being able to retrieve them. Some possible reasons are:

1. Wrong S3 credentials: Laravel might be using the wrong set of AWS S3 credentials for uploading files, which could result in permission issues. The credentials should be checked for correctness.

2. Incorrect file permissions: The files that are being uploaded might have incorrect permission settings, preventing Laravel from uploading them to S3. Make sure that the files have the required read and write permissions.

3. Network issues: Laravel might not have network connectivity to S3 to upload the files. Check network settings and firewall rules.

4. S3 bucket policy: An S3 bucket policy might be preventing Laravel from uploading files to S3. Check the bucket policy and adjust it accordingly.

5. Limited S3 Storage: The S3 storage is limited and might have exceeded the storage. Check the S3 storage and clean up unnecessary files.

Overall, further investigation is needed to identify the root cause of the issue.