How to add a File Picker plugin in Flutter?

I used file_picker library to pick files. you can use this for pick images as well.

Future getPdfAndUpload(int position) async {

    File file = await FilePicker.getFile(
      type: FileType.custom,
      allowedExtensions: ['pdf','docx'], //here you can add any of extention what you need to pick
    );

    if(file != null) {

      setState(() {

          file1 = file; //file1 is a global variable which i created
     
      });

    }
  }

here file_picker flutter library.

I've created a file_picker plugin some time ago in order to make it possible to pick (both on iOS and Android) absolute paths and then loaded it with Flutter.

You can check it here: https://pub.dev/packages/file_picker