Joomla Mixed Content Issue Fix

I have a Joomla website. It had been converted to HTTPS but it loads images over HTTP, causing the "mixed content" warning. The website loads normally in a browser but fails to load images in the mobile browser within the Facebook app, for example. I suspect the reason is this "mixed content" warning. Loads normally in mobile Chrome app though.
I'm seeking a freelancer to fix this.

I cannot give direct access to the website's backend or the FTP server but I can provide copies of the relevant files (php, css, js etc) needed for troubleshooting.

Key requirements:
- Resolve the "mixed content" issue by ensuring all images are loaded via HTTPS.
- Resolve the problem that images are not loading in Facebook's browser in the mobile app.
- Ensure the fix doesn't break the site's layout or functionality.


I manage my site's content using a mix of directly editing HTML/CSS files and Joomla's content management system.

Ideal skills and experience:
- Proficiency in Joomla and understanding of its content management system.
- Strong knowledge of web technologies and the ability to manage "mixed content" issues.
- Attention to detail to ensure the site's functionality and layout are not impacted by the fix.