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%2F2020%2F11%2F%D0%94%D0%BE%D0%BA%D0%BB%D0%B0%D0%B4-2019.pdf but this site is: https://1893.bg