1. A publication system, comprising: processors; and a memory storing instructions that, when executed by at least one processor among the processors, cause the system to perform operations comprising: providing, at a publication platform accessible by users via a network, a portal to receive entry of data for posting on the publication system, the portal including an interface having a first user interface element to receive the data from a user for inclusion in a posting; providing an upload application, associated with the interface of the portal, the upload application including a second user interface element to receive from the user, via the second user interface element, a media file for inclusion in or association with the posting; and automatically commencing transmission of the media file over the network, for inclusion in or association with the posting, before or while the user enters information into the second user interface element.