Security Error: PDF files must be hosted on the same domain as this site.

PDF is hosted on: http://https%3A%2F%2F1893.bg%2Fwp-content%2Fuploads%2F2021%2F06%2F%D0%9E%D0%A2%D0%A7%D0%95%D0%A2-%D0%97%D0%90-2020-%D1%84%D0%B8%D0%BD%D0%B0%D0%BD%D1%81%D0%BE%D0%B2.pdf but this site is: https://1893.bg