Gonna jump back in here. I see there's an open change request to be able to add alt text to URL preview links, but it hasn't been implemented and I haven't found a workaround. Are text readers any help in this situation or is the only option to add a description within the skeet?

So my preference is to build it into the skeet- if it is necessary information. Sometimes site previews are just a company logo. If it’s a picture of a product or a poster, anything that adds value, that should be described. If the person using the reader navigates to the website-