includes metada in cf signed url

I apologize, but based on the information provided in the CloudFront documentation, there isn't a direct way to embed metadata or tags into a CloudFront signed URL for uploading files to S3.

CloudFront signed URLs are primarily designed to provide secure, time-limited access to private content. They don't have built-in functionality for including additional metadata or tags that would be applied to the uploaded file in S3.

When you generate a CloudFront signed URL, you're essentially creating a secure link that grants access to a specific resource through CloudFront. This URL doesn't inherently carry information about file metadata or tags that would be applied during the upload process.

If you need to include metadata or tags with your uploaded files, you might need to consider alternative approaches:

1. Use S3 pre-signed URLs instead of CloudFront signed URLs. S3 pre-signed URLs allow for more granular control over the upload process, including the ability to specify metadata.

2. Implement a two-step process where you first upload the file using the CloudFront signed URL, and then use a separate API call or Lambda function to add the metadata or tags to the object in S3 after it has been uploaded.

3. Create a custom API endpoint (e.g., using API Gateway and Lambda) that accepts both the file and the metadata, then handles the file upload and metadata application internally.

These approaches would require changes to your current implementation but would allow you to achieve your goal of associating metadata or tags with the uploaded files. Remember to consider security implications and ensure that any solution you implement maintains the level of access control you require for your use case.
Sources
Create a URL signature using C# and the .NET Framework - Amazon CloudFront
Code examples for creating a signature for a signed URL - Amazon CloudFront
Decide to use signed URLs or signed cookies - Amazon CloudFront
Create a URL signature using Java - Amazon CloudFront