Umbrella's File Type Control feature—enabled through the Web policy's rulesets—controls identity access to file types. When enabled, an identity that attempts to download a selected file type is presented with a Block page and the requested file cannot be downloaded.
Umbrella checks a file based on the file's file extension. Umbrella also uses its internal detection engine to evaluate a file and determine its type. For example, if a .gif file extension is changed to .xyz, Umbrella is still able to detect that the file is a .gif file. Thus, if your ruleset is set to block .gif files, but allow .xyz files, Umbrella will still block any .gif file that has had its extension changed to .xyz.
Note: File Type Control is only available the Web policy.
Updated about a month ago