Hi,
Thank you for your detailed explanation and for sharing your findings.
The Featured Image field used by our templates is provided by Helix Ultimate, and all of our templates are designed to use this field for displaying article images. This approach allows us to apply the template-specific image handling and functionality that we require.
The Joomla Intro Image and Full Article Image are native Joomla article fields, and we do not have control over how those fields are managed or exposed. As a result, our templates are not designed to use them as a replacement for the Helix Ultimate Featured Image in dynamic content.
For this reason, changing the dynamic image source to the Joomla Intro Image or Full Article Image is not supported by the template.
Thank you for your understanding.