The problem

I have a global set that allows me to access entries from my articles collection. As part of that I am trying to pull out an image from the article - in this instance it's article_image.

My template file looks like:

{{ featured_articles:article }}
   <img class="rounded-md" src="{{ glide:article_image width="500" height="500" }}" alt="{{ article_image:alt }}">
{{ /featured_articles:article }}

If I remove glide the images appear perfectly fine. I also noticed that in the back-end, the preview images don't render when I am looking at the list view of my entries. It must all be related, but hours or googling get me no closer to debugging and fixing it.

Help will be appreciated.