Shopify custom Liquid: Link to admin edit page; focal point preview with a link to the image page where it can be edited; weight preview.

admin_controls.liquid

{% comment %}
Note that the condition checking if you're an admin is very brittle.
Use at your own peril.
We mostly wanted this before launching the store, to quickly go through imported products.
{% endcomment %}

{% if content_for_header contains 'preview-bar' %} 

<div style="background:#efefef">
<b>Admin:</b>

<a href="/admin/products/{{product.id}}" target="_blank">Edit</a>

<p>Focal point:<br>
<a href="/admin/content/files/{{product.featured_media.id}}" target="_blank">
<img src="{{product.featured_media | image_url: width: 600}}" style="object-fit: cover; width: 200px; height: 200px; object-position: {{product.featured_media.presentation.focal_point}}"></a></p>

<p>Weight: {{ product.first_available_variant.weight | weight_with_unit }}</p>
</div>

{% endif %}