inspect canvas
Pictures of the canvas: real drawn slides with every layer, mask and grade, exactly what an export shows, each with a grid ruled in slide pixels (grid: false for the bare picture) and the ids of the layers on it. One slide, several or all, up to twelve a call. Words cut off, off the slide, overlapping, too small or too faint come back as notes on their slide; a picture that could not be fetched is named in not_drawn. Cloud processing.
Authorizations
An API key (es_live_…) from Settings, under API keys, or an OAuth access token.
Headers
Retry a paid dispatch safely: the same key returns the job already dispatched instead of charging again.
The workspace this one call acts in, when it is not the key's own.

