Why does my define page not show up in Define Pages Editor?
Define pages are overridable files, so they can exist in
includes/languages/english/html_includes and/or in
However, the Define Pages Editor has a quirk: a define file must exist in
includes/languages/english/html_includes for it to be visible to the Define Pages Editor. So if you create a new file and only put it in the
YOURTEMPLATE subfolder, it will be visible in the storefront but not in the Define Pages Editor. Simply copy it to the level above, so that is is in
includes/languages/english/html_includes, and your problem will be solved.