I think I've figured out the page 500 error, this maybe likely due to the customization of a template whereas I've renamed some png files so they wouldn't load, but oddly I think it shouldn't give me the error on admin side.
About Pages part II - because there doesn't seem to be a way to add completely new pages (extra dashboards, video, streaming pages etc except for "custom html" or "external links" pages, I have alternatively installed storytlr on multiple domains with external links connected to each subdomain as pages but now I'll need to know where to add metatags to each new custom html page & all other pages created.