FilePickerFileType
Defines the file types that can be selected using the FilePicker.
FilePickerFileType enum has the following values:
ANY
Allows any file type.
AUDIO
Allows only audio files.
CUSTOM
Allows only the custom file types specified in the allowed_extensions list.
IMAGE
Allows only image files.
MEDIA
A combination of VIDEO and IMAGE.
VIDEO
Allows only video files.