I want to load another file after I had clicked loading the data .How to make it load from the place where I insert the latest time
That's very hard to do. The script runs to completion. If it aborts somewhere then it can't be restarted there. It will exit.
But I see no reason why you can't simply open the script editor, change your script to add the load statement for the next file and reload the document.
Retrieving data ...