Demo

Random

Explanation

<div
    id="file_upload"
    data-store="{id:237, min: 1, max: 1024}"
>
    <img data-bind-src="`https://picsum.photos/id/${$id}/640/320`" />
    <input type="number" step="1" data-bind-min="$min" data-bind-max="$max" data-model="id">
    <button data-on-click="$id = $$fitInt(Math.random(), 0, 1, $min, $max)">Random</button>
</div>

A discussion on the Discord channel found a bug in binding images. This is an example to make sure it works going forward. The bind of src to a template literal allows for a dynamic url and is hitting the picsum backend, not ours so no HTML fragments are needed.

The $$fitInt actions is a nice helper to simplify picking a random valid number.