Media picker upload file API call sequence

atlaskit

#1

Hi, I would like to know if there is any documentation on using media picker to upload files? Doc here https://atlaskit.atlassian.com/packages/media/media-picker have little info on what APIs are expected to be implemented on server side to upload files. There are various API calls to upload files e.g. /upload/createWithFiles, /chunk/probe, /chunk/, /upload//chunks and /file/upload. I could not find in docs what are request params and expected responses for these APIs.
Can someone please explain these APIs or point to the doc somewhere?