Multisite has SSL certificate, but media library is still http://

Replace all links before the installation of the SSL (you can update the links via SQL)

Your wordpress should throw out https:// links now after the installation of the SSL certificate. This problem is due to wordpress decision to insert full links when inserting media through the editor.

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