Setup AWS infrastructure to let customers drop files
Some ideas:
- AWS Transfer provides a managed sFtp front end to S3, user management here. Beware it's about US$216 per month to enable the service and $0.04 per GB, plus I think you have to pay for AWS Directory Service. It would be cheaper to run a standard sFtp server on Lightsail.
- IAM users with S3 rights is an option, may be more work but it's a LOT cheaper. IAM users cost nothing, and you can set up an S3 bucket so each user has their own folder. It's more work for the user though.
- Write a web-app
- Use Dropbox