Security Error: PDF files must be hosted on the same domain as this site.
PDF is hosted on: http://https%3A%2F%2Fsek-kaval.kav.sch.gr%2Fwp-content%2Fuploads%2F2020%2F11%2F11_04_2018_%CE%94%CE%B5%CE%BB%CF%84%CE%AF%CE%BF-%CE%A4%CF%8D%CF%80%CE%BF%CF%85-%CE%99%CF%84%CE%B1%CE%BB%CE%AF%CE%B1.pdf but this site is: https://sek-kaval.kav.sch.gr