how to make a javascript add a file that you have uploaded by <input type="file"> in hyml code example

Example 1: input file define type

<input type="file" accept=".gif,.jpg,.jpeg,.png,.doc,.docx">

Example 2: upload button in html

<form action="/action_page.php">
  <input type="file" id="myFile" 
  name="filename">
  <input type="submit">
</form>