Hello! I am struggling with an issue on the "Images and links" tabs of any article, when I try to select an existing image by using the JCE media manager it returns a blank page inside the modal. Seeing the console, it returns a mixed content error like this:

Mixed Content: The page at 'https://domain.com/administrator/index.php?option=com_content&view=article&layout=edit' was loaded over HTTPS, but requested an insecure frame 'http://domain.com/administrator/index.php?option=com_jce&task=plugin.display&element=jform_images_image_intro&converted=1&mediatype=images&context=19&plugin=browser&standalone=1&615a391424988b403305b74f0da0befe=1&client=1'. This request has been blocked; the content must be served over HTTPS.

configuration.php live_site is set up with HTTPS at the beginning, but somehow it's still requesting for the HTTP link?
Also, If I change settings to use the default J! image manager for that, it works just fine so I incline to think its a JCE issue.

Updated Joomla and JCE to the latest version, but the problem still persists, do you know what can be happening?
Thanks in advance

Well that seems weird, havent encountered any of that warnings (screen attached), also considering that the issue is only presenting in the image manager with JCE enabled. So far I solved it myself by rewriting any http: link via .htaccess adding the line:

Header always set Content-Security-Policy "upgrade-insecure-requests;"

So thanks anyway, but would be great to know WHERE the modal is calling the url of the first message screenshots. Have a great day!