If the user has an assigned ID and if you are placing their files in a specific path in your S3 bucket or in a separate bucket altogether, you can additionally include the
customSourcePath parameter or the
customSourceContainer parameter when the picker is launched in order to display just their files in the custom S3 source
Another alternative would be to load the picker into your own custom iframe using the
container parameter, and in one section show previously uploaded files, and in another section display the standard picker options.
Someone from our team will get back to you shortly.