Regular images with the placeholder variable name as alt text works, but not quite what I need.
I'm after is using content controls, which use label/key for identifying, and that doesn't seem to work with replacePlaceholderImage, nor does the documentation mention it works with content controls.
Is there an example of replacing images in document for content control image?
Edit:
Reason I need it, instead of using the alt-text method, is that it would take a lot more time to explain to users both how to use content controls, and now also having to use alt-text. I quickly gets confusing and overwhelming for non-word-experts.