S3 integration not working and not throwing any error.

[PolGuixe]

I am trying to set-up an AWS S3 integration and it isn't working. Here is the config: https://gist.github.com/PolGuixe/0acfb2070861a563f0184789cd5bb177

When I upload a file, the document es created in the collection. Uploaded to the server and then "transferred" to S3, however it never arrives to my S3 bucket. Then the file in the server is deleted and the document points to a non existing file.

1. Any idea why my integration isn't working?
2. Shouldn't the server throw and error if it is unable to access the server?

[PolGuixe]

Knox does not supper S3 in eu-central-1.

See: Automattic/knox#273