Get file contents after pageload
Solution 1:
Did you try with the onload property on the <img /> tag ?
<img src="w3html.gif" onload="loadImage()" width="100" height="132">
<script>
function loadImage() {
alert("Image is loaded");
}
</script>
https://www.w3schools.com/tags/ev_onload.asp
You will need to use javascript as the image is on a remote server and loaded on client side