With the help of the link AWS Watermark Image for Drag, Drop & Upload Files to Amazon S3, you can easily understand the steps to configure the AWS Watermark image for Drag, Drop & Upload Files to Amazon S3 app.
PS: View Drag, Drop & Upload Files to Amazon S3, a Salesforce AppExchange app for moving files from Salesforce to Amazon S3: https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3000000B5ZPqEAN
