[doc] [S3] Pydio creates a *new* container suffixed by `+segments`

While I provided an existing S3-compatible container to my instance during the initial configuration, I got surprised to see that a brand new container got seemingly automatically created by Pydio.
Its name is derived from the original one by appending +segments.

There is no information about this at https://pydio.com/en/docs/cells/v2/s3-compatible-storage and I find this quite surprising.
What would happen, for example, if the access token provided did not allow for new container creation (which would be safer configuration)?