How to make files dynamically generated/saved by Cordova iOS APP accessible to the end user?

I'm using the cordova-plugin-file to save some data image to the user's iOS phone.

saveBlobAsImageFile(folderpath, filename, blob) {
  const onError = function(msg) {
    // handles error
  }

  window.resolveLocalFileSystemURL(folderpath, function(dir) {
    console.log("Access to the directory granted");
    dir.getFile(filename, { create: true }, function(file) {
      console.log("File created")
      file.createWriter(function(fileWriter) {
        fileWriter.write(blob);
        console.log("Written file")
      }, onError)
    }, onError)
  }, onError)
}

for the folderpath, I tried all of these 5 options:

let folderpath = cordova.file.syncedDataDirectory;
let folderpath1 = cordova.file.documentsDirectory; 
let folderpath2 = cordova.file.dataDirectory;
let folderpath3 = cordova.file.cacheDirectory;
let folderpath4 = cordova.file.tempDirectory;

After running the function saveBlobAsImageFile, the log shows the successful writing, but when I go to Files or Library in my simulator/iPhone, I cannot found any saved file.

Update: When I run in simulator, after clicking save, I found the file saved in these folders:

file:///Users/ngoctuan001/Library/Developer/CoreSimulator/Devices/2964FE69-A5FE-4516-B8F1-C45488DBE2B5/data/Containers/Data/Application/1EF9FF0C-903E-481F-87A0-9A1CEDA4DE5D/Library/Cloud/
file:///Users/ngoctuan001/Library/Developer/CoreSimulator/Devices/2964FE69-A5FE-4516-B8F1-C45488DBE2B5/data/Containers/Data/Application/1EF9FF0C-903E-481F-87A0-9A1CEDA4DE5D/Documents/
file:///Users/ngoctuan001/Library/Developer/CoreSimulator/Devices/2964FE69-A5FE-4516-B8F1-C45488DBE2B5/data/Containers/Data/Application/1EF9FF0C-903E-481F-87A0-9A1CEDA4DE5D/Library/NoCloud/
file:///Users/ngoctuan001/Library/Developer/CoreSimulator/Devices/2964FE69-A5FE-4516-B8F1-C45488DBE2B5/data/Containers/Data/Application/1EF9FF0C-903E-481F-87A0-9A1CEDA4DE5D/Library/Caches/

However, when I go to the simulator files and library, these images are not found.

How to make dynamically generated files by the iOS Cordova APP accessible to the end user through the library?