How to force httpS on file browser?

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Hi I'm using El Finder as file browser for tinymce with this bundle in Symfony 5. It works great in local dev environment (even in HTTPS) but I get this error in prod environment: The page at 'https://mydomain/admin/edit' was loaded over HTTPS, but tinymce.min.js requested an insecure frame 'http://mydomain/elfinder'. This request has been blocked; the content must be served over HTTPS. Is there a way in config to force tinymce to call El Finder over HTTPS ? Thanks Cyril