How to make AWS S3 work?

Hi everybody,
I’ve added a aws provider and set the prototype of s3 in setting.yml to true like this:
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However, I didn’t see the S3 worker is working through evm.log while I can see manageiq is trying to select s3 worker from database as below:


Actually the s3 worker didn’t in the ext_manager_systems table at all, like this:

Is there any step I lost? Thanks for attention.