Architectural and design question about uploading photos from iPhone app and S3

Question

I want to allow users of an iPhone app to upload photos and use Amazon S3. There are 2 ways I see going about this:

1. Upload from iPhone to my server, which pro

Answer 1

I m confused. Why would amazon come up w/ the ios sdk to upload data to s3 then tell us not to use it (Embedding credentials in source code is problematic for software, including mobile applications, because malicious users can de-compile the software or view the source code to retrieve the Secret Access Key)???