How to redirect url link to file without http to link with https?

Question

htaccess

Good day! I redirect from http to https like this:

RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]

But this does not happen with files, for example, pdf files are not redirected, but are immediately opened by the browser with http. How can this be fixed?