Example of loading into RDS from S3 using SQL*Loader

Does anyone have a working sample of loading data into an Amazon AWS RDS Oracle database using SQL*Loader where the source file is on S3? In principle it's clearly possible. The Amazon RDS Data Import Guide for Oracle documents using sqlldr. But the only sample there loads data from a local EC2 instance. I have worked with RDS and with S3 and with SQL*Loader before, but I haven't worked with all 3 together. One sample would be really useful. (Related advice would be welcome too... but a sample is all I'm really looking for.)