自定义URL将文档导入iPad Excel

Has anyone found the syntax to import a file to the new version of Excel on the iPad? This can be done from the OneDrive app, but I can't seem to find any documentation that would explain the name/value pair that is required. It is also unclear if Excel will open a file that is local to it; it might be that all files must be in the OneDrive cloud. Inspection of the info.plist shows that you can launch Excel from another app using any of the following urls: launch-excel, open-excel, ms-excel, excel, but it unclear how you can pass a file to it and if the file could be a csv or other format. Thanks for your help.Has anyone found the syntax to import a file to