Jquery: change input file value inside an iframe

I have a page where there is an input file. In this page there also is an iframe that contains another input file. So, when the input file in main page changes, I want that the input file inside iframe also changes its value to the value of external input file. But it doesn't work, i use this code in main page: $('#iframe').contents().find('#input_file').val(myvalue); The value of `#input_file` file remains empty. What could be the problem

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