Hi, first a short status. All the image Alt-Tags are shown after <div class="img "> in the html source (without the usage of SEO-Plugins). And the generated image-sitemap.xml outputs images and Alt-Tags correctly. But...
even after months doing the Google Image Search with 'site:' it only shows a few images and ignores the Alt-Tags i added to each image in the Media Lib. And the Google Search Console doesn't detect any image in either sitemap.xml and image-sitemap.xml.
Same result with the Screamin Frog SEO Spider Tool, no indexable images found. By the way, this also affects to other laytheme sites that I've scanned with this tool - and might therefore probably be a general problem. Only when I link the images (Set Image Link) they're listed and shown as indexable, unfortunately again without any effect on crawling & indexing by google - that shouldn't be the solution either.
Is it a structural problem of the laytheme that google cannot crawl & index the images with the attached Atl-Tags? Is it possible to solve this critical problem and make laytheme more SEO-friendly? Or can this be fixed with a manual workaround, if necessary also a dirty one?
A few clarifying words would be very helpful!