We have tried implementing an AWS SFTP location with Adobe Launch, which we discovered is not supported.
From our support rep:
"I checked internally and found that Currently 'S3 does not support SFTP Symlinks for Launch SFTP Hosts'. It is my understanding engineering is considering this as a feature in the future, but I do not have a guarantee that they will implement support for this.
Options going forward are to create an archive and manually place the library on the AWS location
https://33sticks.com/how-to-self-host-a-launch-library/ Or host using an SFTP that does not link to AWS."
We would like the ability to push files to an Amazon or Azure host.