'Properties' object passed into the WL.backgroundUpload method.
The file input object to read the file from. Can be a Windows.Storage.StorageFile or an IFile.
The name of the file to upload.
Indicates whether the uploaded file should overwrite an existing copy. Specify "true" to overwrite, "false" to not overwrite and for the WL.backgroundUpload method call to fail, or "rename" to not overwrite and enable SkyDrive to assign a new name to the uploaded file.
The path to the file to upload.
The file input stream to read the file from.