Flutter share file

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I am using share 0.5.3 of flutter to share text and it works well.
I would like to know to share txt/csv file (without convert a file to string) in flutter. According the the example here, it only convert the file into string and share. This is not what I want.

import 'package:share/share.dart';

final RenderBox box = context.findRenderObject();
Share.share(text,
sharePositionOrigin:
box.localToGlobal(Offset.zero) &
box.size);

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