Want to do the exact same thing in Isotope.
Struggling with this...
In my case I just want to add the possibility to add Bckg image - Overlay choice to all my existing Outlines
First, I was able to add the Image Background choice in all existing Outlines “LAYOUTS” tab by following EXACTLY this tutorial —> docs.gantry.org/gantry5/advanced/customizing-theme-files
Saddly, witout having the same possibility in the “STYLES” tab of the Outlines, I can add background images to all Sections by the “LAYOUTS” tab but cannot use Parrallax settings.
For some obscure reason, to use Parallax & Overlay, I need to have the Background Image possibility set in the “STYLES” tab of the Outline and Set the Parallax settings in the “LAYOUTS” tab (not really user friendly, two tabs for one setting...)
Meaning that I need also, to add the possibility to the “STYLES” tabs.
I was able in the following example (for the Showcase Section) to add to the “STYLES” tab of all Outlines the input for Back Image & Overlay by adding the bkg/overlay code to the file “showcase.yaml” in the template blueprints folder.
But the Inputs have no effects ?
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I can upload the site live, if neccesary (only a local Mamp test site)