So where are you for now?
(I mean writing a code)
var myFolder = new Folder("~/Desktop/Your_Folder");
app.activeDocument.save(myFolder.fsName + "\\" + "myIndesignFile.indd");
In Adobe Interactive Form I need to provide "SAVE" button, so that end user can save it in local.
I had tried your code but no use.......
The form will have to be processed through Acrobat and resaved there as a Reader Extended PDF to enable this. Only way I know.