Hi! I just ran across this thread when sifting through old cases. The best way to get a hold of us quickly is by submitting a request through our support center. This will also allow you to receive personalized help.
Now, onto the questions.
How Related Content works:
First, when our plugin is installed on your site, our server attempts to index the pages of your site by checking for an XML sitemap and retrieving the URLs from this list, passing them into our processing queue to be crawled as individual pages.
When the pages are crawled, we extract various pieces of data that are used in calculating the relationship of one page to another. Meta tags are definitely useful to provide more information about your content.
We have continued to work on the intelligence portion of this app so as to improve the calculated relationship between pages. This is a complicated coding process, so I am unable to provide specific details in how the machine learns, but it is the backbone to the Related Content app.
Once we have data for each page, a file is generated to summarize a list of pages so that it can be passed along to the recommendations engine, which handles the delivery of your recommendations. The app is a very complex network of systems that work together to produce this feature, and it will continue to improve as we further refine the code.
There are additional aspects that aren't explained above, but this is generally how Related Content works at this time.
If you are having trouble with images, you might just need to refresh your page data in our system. Here's an article with information on how you can do this independently from your settings panel.
And if you have any additional questions, concerns or issues that haven't yet been resolved, please do submit a request through our support center with your website address, a description of the problem, and any steps you have taken to try and resolve it independently. Thanks so much and happy holidays!