App Platform mixed content issues

I keep getting mixed content errors on my Laravel App deployed on App Platform. What I tried so far:

1. Editing the .htaccess file to

<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews -Indexes
    </IfModule>

    RewriteEngine On

    # Handle Authorization Header
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} (.+)/$
    RewriteRule ^ %1 [L,R=301]

    # Send Requests To Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]
</IfModule>

2. Made sure the .htaccess files was in both root and public folders
3. Added APP_URL variable to environment variables and ensured it starts with “https://…”

Not really sure what else to look for at this point. The app is not loading any of my images or javascript files (all in public folder) because of mixed content issue. Anyone have any ideas?