Error using FileReader

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In a previous post someone asked if the FileReader API could be used in Velo and someone else replied with an example:

$w . onReady ( function ()
{
const fileReader = new FileReader ();

fetch ( "c:\\a.png" ) 
    . then ( response  =>  response . blob ()) 
    . then ( blob  =>  fileReader . readAsArrayBuffer ( blob )); 

fileReader . onload  =  **function**  () { 
    // your buffer array here. But why you need it? ))) 
    console . log ( fileReader ); 
}

})

Unfortuntaley, it doesn’t work for me. I tried using a PNG file on my hard disk and the result is an empty array.