Flutter does not support content:// uri in Android. I cannot use such a uri in the File class to read the attached file in Gmail (for example, when opening an attached file from an email through a flutter application via deep linking).

You can write a plugin that will read files at such a URI, but this will not be a cross-platform code, since you will have to remember that in Android, content:// uri files must be read through the plugin, and in iOS via File class.

It would be nice to support this type of uri in the File class on Android.