Window.showOpenFilePicker() - Web APIs | MDN
The showOpenFilePicker() method of the interface shows a file picker that allows a user to select a file or multiple files and returns a handle for the file(s). An optional object containing options, which are as follows: multiple: A . Default false. When set totrue multiple files may be selected.
https://developer.mozilla.org/en-US/docs/Web/API/Window/showOpenFilePicker