Image security/privacy on S3

I’m also finding that anyone with the link to the file stored in the s3 bucket can download the file. How do we lock it down?

You have to make the file private then attach it to a thing. Theres a checkbox in the upload element

Does anyone know why I can’t upload a full scale image when I click the File/Photo to be Private in the upload element? It’s resizing the image size to a smaller one