How do I read a local file on android?

What is the simplest way to read a local text file (on an android device)?

I’ve tried:

  readAsString = async () => {
    let result = null;
    try {
      result = await Expo.FileSystem.readAsStringAsync(Expo.FileSystem.documentDirectory + 'screens/rn.txt');
    } catch (e) {
    return result;

    var readtest = Promise.resolve(this.readAsString())
    readtest.then(function (value) {
      console.log("hello file: " + value);

/data/user/0/host.exp.exponent/files/ExperienceData/%40vidarso%2FSau/screens/rn.txt (No such file or directory)

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