How do I upload a game build?

Two routes, depending on size:

• In the app, from your game's Builds section — good for small and medium builds, with progress shown as it uploads.
• With the Creta build tool, a command-line publisher, for large builds. It works out what changed since your last build and uploads only that, resuming where it left off if the connection drops — which matters when a build is tens of gigabytes. Approved developers are given access to it.

Build and media management is only available in the desktop app. Opening those pages in a browser shows a note saying so, because handling large local files is something a browser tab cannot do properly.