StreamProviderOptions property. The user custom pathURL saved in generated Html file for the referred source. If not defined by user DefaultPath will be used. For example the sheet data will be saved by user to d/sheet001.Htm the url used in the main Html file should be d/sheet001.Htm or other valid relative path that can be accessed by the main Html file...htm, the url used in the main html...file should be “d:/sheet001.htm” or other valid relative path...