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Google AppMaker: How to update textbox value after choosing a file from Google Drive?

What i want to do is, after I choose a file from Google Drive (Press "Open Drive" button to choose), the textbox named Ref1 will have the file's url. And when I press the "Add" button, the link will be inserted into the database. I have already bound the value of the textbox to @datasource.item.Ref1 column and the URL is stored in a custom Property of the page named FileUrl. The problem is I don't know how to pass the value to that textbox.

Form example

Form screen shot

P/S:I found the answer, sorry bothering you

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