Error when uploading file into bucket

When encountering issues with file uploads to an S3 bucket, especially for large uploads or multiple files, it can be challenging to identify which specific files failed to upload if you don't catch the error in real-time. However, there are a few approaches you can take to identify and resolve this issue:

1. Use the AWS CLI with the s3 sync command: This command can help you synchronize your local folder with the S3 bucket. It will only upload files that are missing or have changed. Run the command again, and it should attempt to upload any files that failed previously.

2. Enable CloudWatch Logs: If you're using S3 File Gateway, you can configure Amazon CloudWatch Logs to monitor your gateway and get information about errors it encounters, including failed uploads. This can provide detailed error messages and identify specific files that failed to upload.

3. Check S3 bucket versioning: If you have versioning enabled on your S3 bucket, you might be able to compare the versions of files in the bucket with your local files to identify any discrepancies.

4. Use the S3 inventory feature: This can give you a list of all objects in your bucket, which you can compare against your local folder to identify missing files.

5. Review IAM permissions: Ensure that your IAM user or role has the necessary permissions to upload all file types to the S3 bucket. Sometimes, permissions issues can cause selective upload failures.

6. Check for file-specific issues: Large files or files with special characters in their names might fail to upload due to size limitations or naming conventions.

For future uploads, consider using multipart upload for large files, which allows you to resume interrupted uploads. Also, using AWS CLI or SDK with proper error handling and logging can help you keep track of failed uploads more effectively.
Sources
Monitoring your S3 File Gateway - AWS Storage Gateway
S3 sync command is failing | AWS re:Post

Hello,

The AWS Console has limitations when uploading a large quantity of files. The AWS Command Line Interface (CLI) provides a more efficient solution through the sync command:

aws s3 sync /local/folder s3://your-bucket-name

To implement this solution:

1. Set up AWS CLI and IAM User Access Keys
2. Use the sync command to upload your files

Reference documentation: AWS CLI Setup S3 Sync Commands