Allows users to upload and share files. You can upload any file of up to 5 MB in size. This feature is commonly used in social apps to share images, or in medical apps to share medical records for patients.
When a file is uploaded on a
channel, it's stored and managed using a storage service, and associated with your key. Subscribers to that
channel receive a file event which contains a file
filename, and optional
Upload file / data to specified