themes/mytheme/templates/SilverStripe/Blog/Model/Layout/Blog.ss (I think... I'd need to check!)
i'll try that
Basically, you need to match the structure from the thing you're overriding
hmm, i know in previous version of SS that wasn't necessary
is there something I can add to my theme.yml to modify that?
or is that just the way it is now in SS4?
No.. that's the way it works now. It's actually a better way to do it, as it takes away the possibility of conflicts between modules