To update multiple files at once or automate the process, use the AWS CLI . Since metadata cannot be edited in place, you essentially "copy" the object onto itself with new metadata.
Sometimes you want a file to be viewable normally but force a download only for specific links. You can do this by overriding the response headers when generating a . AWS CLI example: aws s3 how to download file instead of displaying in-browser
If your application uploads files to S3, you should set this header at the time of upload. To update multiple files at once or automate
import boto3 s3 = boto3.client('s3') s3.upload_file( 'local_file.pdf', 'your-bucket', 'remote_file.pdf', ExtraArgs={ 'ContentDisposition': 'attachment; filename="download.pdf"', 'ContentType': 'application/pdf' } ) ``` Use code with caution. 4. Using Pre-signed URLs (Dynamic Overrides) ExtraArgs={ 'ContentDisposition': 'attachment