AppendFile Method
Appends data to an existing file.
Syntax
public fun appendFile(filePath: String?)
Remarks
This method appends data to the existing file at FilePath.
If SetUploadStream has been used to set an upload stream, it will take priority as the data source. If LocalFile is set data will be read from the file at the specified path. If LocalFile is not set the data in ResourceData will be used.