hi @bernicechua,
thank you for replying so fast!
Unfortunately this is not working. Below I’ve attached images to give as an example:
In the first image you see an image with an ALT text in the wordpress media library
Here in the second image you see the stackable page editor with that image, not having an ALT text specified.
In the third screenshot here, you can see the rendered HTML. the image does not have an alt text.
Therefore, I think the alt text from the media library is not used in the template as a fallback for when the alt text empty in the page editor.