Hi, use the one that is described in the swagger file. The first link you posted is for the REST API v1 - it’s still in the platform for old applications that used it before REST API v2 was released. New applications should use REST API v2.
The files I upload are just temporary. I read and integrate them in database and then they are not needed anymore. With rest api v2, I need to do the cleaning myself, but that’s not a big deal.