Documents folder path discrepancy between Android version (9 et 15)

I'm in testing step of my MAUI application, and I have an issue when testing on a emulated Android 9 (API 28). I was testing and correcting my code on last Android version (Android 15, API 35), and then downloaded my APK to my phone which is under Android 9 (my old but still functioning S8+). And I had issue when Load/Save json file through my application. So I decided to create another emulated android device under Visual Studio, and create an Android 9 API 28 one.

I Then add some log/trace in my code to easier debugging and found the discrepancy causing the issue.

Here is a part of my saving code showing it :

FileSaverResult? savedFile;
using var memoryStream = new MemoryStream();
      
savedFile = await _fileSaver.SaveAsync(Path.GetDirectoryName(fullPath), Path.GetFileName(fullPath), memoryStream, cancellationToken);
      
memoryStream.Dispose();

if (savedFile == default || !savedFile.IsSuccessful ||savedFile.FilePath == default)
  return;

DiagnosticsUtility.WriteLine($" --- Picked save file is : {savedFile.FilePath}");
DiagnosticsUtility.WriteLine($" --- File exist ? {File.Exists(savedFile.FilePath)}");
DiagnosticsUtility.WriteLine($" --- Directory exist ? {Directory.Exists(Path.GetDirectoryName(savedFile.FilePath))}");

and here are the log :

Android 15 (API 35)

 --- Picked save file is : /storage/emulated/0/Documents/LotoRelease/Loto.json
 --- File exist ? True
 --- Directory exist ? True

Android 9 (API 28)

 --- Picked save file is : /storage/home/LotoRelease/Loto.json
 --- File exist ? False
 --- Directory exist ? False

So returned path on Android 9 (API 28) for Documents folder is /storage/home which is not considered existing ?! Note that if select instead the Download folder, then I have the same, correct, result /storage/emulated/0/Download on both emulated Android version (9 and 15).

Since I want to offer the user of my application to save / load in any folder they want, and not only in Download folder, how can I get back the correct existing path on Android 9 ?

I did search on google for

"/storage/home" + Android

But found no result. What is this /storage/home path ? I don't want to hard code a replacing of every path with /home to /emulated/0/Documents, I'd prefer a more generic solution.