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major sandbox commands only work when run inside a Major sandbox. On a locally installed CLI, every major sandbox subcommand fails.
major sandbox groups commands that act on the Major sandbox the CLI is running in. The major CLI is preinstalled in sandboxes, so you can run these from a sandbox shell.

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major sandbox upload-url

Get a single-use URL that uploads one file into the sandbox at the given path. The command prints the URL, when it expires, and a curl command to upload with.