The container URL where the file is to be saved.
The file to be written.
The Access Grant VC proving the caller is authorized.
Optional
options: Partial<SaveFileOptions>Optional properties to customise the request behaviour, or override the Content-Type of the file.
A promise that resolves to a File if successful, and that rejects otherwise.
Saves a file in the given container URL using an Access Grant to prove the caller is authorized to save a file in the given container.