How to use rusotos3sink for uploading snapshots

[pushforce]

Hello, I want to use an rusotos3sink to periodically upload a snapshot 
to AWS S3.
I created a pipeline like this :

gst-launch-1.0  \
    videotestsrc ! \
    videorate ! \
    video/x-raw,framerate=1/30 ! \
    jpegenc ! \
    rusotos3sink bucket=example-bucket key=my/file.jpeg region=us-west-1

But the images are not loaded.

How can this be fixed?

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