On my site there is a file that is not using the cache and has these
values.
Does anyone know why?
Response Headers
cache-control: no-store, no-cache, must-revalidate, max-age=0
cf-cache-status: BYPASS
This header is being sent by your server. The no-store part means it will always bypass the cache, docs.
Once you edit that header, then it should start caching.