pickFile static method
Implementation
static Future<void> pickFile(
ValueNotifier<List<PlatformFile>> selectedFile, FileType fileType) async {
final FilePickerResult? result =
await FilePicker.platform.pickFiles(type: fileType);
if (result == null) {
return;
}
final PlatformFile file = result.files.first;
selectedFile.value = [file];
}