The file metadata is damaged, making it impossible for the device to identify what it is trying to download.
A temporary error in the operating system (common in some iOS and Android versions) where the text placeholder isn't replaced by the actual file name. download null using cellular data
Apple previously capped cellular downloads at 200MB, but you can now remove this limit: (null), phone getting hacked? - Apple Communities The file metadata is damaged, making it impossible
In some cases, third-party apps may create ".null" files due to corrupted data or malicious background activity. How to Download Large Files Over Cellular Data The file metadata is damaged
If you actually want to bypass these warnings and use your mobile plan for big downloads, follow these steps: For iPhone (iOS)