The File datatype is used to store files. This can include a video, audio file, pictures, text documents and many more. When uploading files, there is a limit of 32MB per file. Check the specific File Functions for examples on how to work with files and their properties.
Files have a validation property that can be used to restrict files to a certain file-type. This can change how the modeler handles this file. When an file has the image validation and this file field is added to a interaction canvas you will have the possibility to add it with the display option as image directly for example.
An unknown value can be written as UnknownFile.