get an upload URL
A URL to PUT the file to, valid one hour. Then POST /uploads/confirm. Ceilings: images 20 MB, audio 500 MB, video 10 GB, documents 25 MB.
POST
get an upload URL
Authorizations
An API key (es_live_…) from Settings, under API keys, or an OAuth access token.
Headers
The workspace this one call acts in, when it is not the key's own.
Body
application/json

