Task<ObjectId> UploadFromStreamAsync(
	string filename,
	Stream source,
	GridFSUploadOptions options = null,
	CancellationToken cancellationToken = null
)

Function UploadFromStreamAsync ( 
	filename As String,
	source As Stream,
	Optional options As GridFSUploadOptions = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of ObjectId)

abstract UploadFromStreamAsync : 
        filename : string * 
        source : Stream * 
        ?options : GridFSUploadOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<ObjectId>