Get upload URL

To use the provided temporary storage is a two step process. You start by declaring a media:// url that you can reference in any other API calls. The response will provide a url where you can put your media. This allows you to use the media:// url as a short-cut for a temporary storage location. You'll be returned a pre-signed url you can use to PUT and upload your media file. The temporary storage should allow you to read and write to the media:// locations for a period of at least 24 hours before it is removed.