Are you trying to them to the police or a government portal?
If submitting via a data box (datová schránka), ensure the photos meet the official technical specifications (usually a standard 35x45mm aspect ratio, high resolution, and a neutral background). AAA-Fotky do ZP 2023.zip
If you are preparing these for an application, keep in mind the current requirements in the Czech Republic: Are you trying to them to the police or a government portal