Security Error: PDF files must be hosted on the same domain as this site.
PDF is hosted on: http://https%3A%2F%2F1epal-kaval.kav.sch.gr%2Fwp-content%2Fuploads%2F2019%2F08%2F1%CE%BF-%CE%95%CE%A0%CE%91%CE%9B-%CE%9A%CE%91%CE%92%CE%91%CE%9B%CE%91%CE%A3-1.pdf but this site is: https://1epal-kaval.kav.sch.gr