Where exactly is the code generating this popup on Luma's one page checkout, so I can add a custom HTML block after "Sign In"?
I tried every place I could think of, but nothing seems to work. The browser console shows that the "Sign In" heading is wrapped inside a "block-customer-login-heading" element. Searching for that element in the Luma template folders brings up the following results:
I tried editing each of those files in my child theme, using these paths:
(also tried without /frontend, just in case...)
Cleared the cache. No custom block shows.
Is there anywhere else I should be looking or am I just not using the right paths?