I run a site with dual branding. A national brand paired with a local brand.
On a landing page created via hubspot I've added a rich text module to house a static image for the national brand (always present) and an coded image sourcing from on online collection of images with the suffix of a dynamic code injection from our Hubspot records.
The intention is that someone who we have the details of visits the site then they get the local brand as well as the national. This is working in the most part however for iOS visitors, when the image doesn't render, a black box appears as below.
Any idea how I could resolve this? FYI my html skills are intermediate at best.