[Bug] iOS: Launcher.OpenAsync() Bugs out

[Edgaras91]

Description

Using Xamarin.Forms, iOS device OpenAsync overlay that appears in iPhone bugs out.
Other apps do below without any issues.
File is .xlsx format.

Steps to Reproduce

1. Save file to iPhone using this:

            string path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            string filePath = Path.Combine(path, filename.xlsx);
            try
            {
                FileStream fileStream = File.Open(filePath, FileMode.Create);
                fileStream.Write(bytes);
                fileStream.Flush();
                fileStream.Close();
            }

2. Open File:
   await Launcher.OpenAsync(new OpenFileRequest { File = new ReadOnlyFile(filePath) });
3. Select "Save to Files"
4. Press Cancel
5. Select "Save to Files" again
6. It will bug out - not go in to "Save to Files", screen flash and stay where it is

Expected Behavior

To be able to "Save to Files" when you go back and forth in the menu.

Actual Behavior

Not able to "Save to Files" on 2nd attempt in the same overlay session

Basic Information

• Version with issue:

• Last known good version:

• IDE: VS2019

• Platform Target Frameworks:

  • iOS: 14.2
  • Android: 11.0 (N/A)

• Nuget Packages:
  Xamarin.Essentials. 1.6.0-pre2
  Xamarin.Forms 4.8.0.1687

• Affected Devices:
  Simulator and Physical, both iPhone 12 Pro Max (iOS 14.2)

Screenshots

[dimonovdd]

I also encountered this problem

File is .xlsx format.

this applies to files with different extensions

[dimonovdd]

this correctly work on iPhone 7 Plus with iOS 13.5

[dimonovdd]

@mattleibow I noticed that it works on ios 14, but the opening "save to files" dialog takes a very long time. But the second and next times the opening is fast.
it works faster on ios 13.

Videos:

1. iOS 13.6
2. iOS 14.3

I've also made some minor changes to the code and I think it's working faster
link

[mattleibow]

Thanks for the PR.