Cannot add image (png, jpeg, etc.) but can add pdf, 403 forbidden when posting

Many times, this type of issue occurs due to SSL as well. So, try adding these plugins one by one, such as Really Simple SSL, SSL Insecure Content Fixer, or WP Force SSL & HTTPS SSL Redirect, and see if the issue is fixed

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)