[BUG] FileSaver on Mac - new GUID used for name instead of name provided

Is there an existing issue for this?

• I have searched the existing issues

Did you read the “Reporting a bug” section on Contributing file?

• I have read the “Reporting a bug” section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

Current Behavior

The Mac implementation of the FileSaver uses a GUID instead of the filename provided as a parameter when setting the suggested file name in the save dialog. The parameter is correctly used to set the file extension.

Expected Behavior

The filename provided as an argument should be used to set the suggested name in the save file dialog.

Steps To Reproduce

1. Use a mac
2. Invoke the FileSaver.SaveAsync(fileName, stream, cancellationToken) method
3. Observe the “Save As:” parameter in the dialog that opens

Link to public reproduction project repository

https://github.com/RoryRoberts/maui-community-toolkit-filesaver-guid-bug

See: https://github.com/RoryRoberts/maui-community-toolkit-filesaver-guid-bug/blob/main/MauiApp1/Shared/MainLayout.razor#L16

Environment

- .NET MAUI CommunityToolkit: 5.0.0
- OS: macOS Ventura 13.0.1
- .NET MAUI: 7.0.100

Anything else?

Suspected relevant code: https://github.com/CommunityToolkit/Maui/blob/main/src/CommunityToolkit.Maui.Core/Essentials/FileSaver/FileSaverImplementation.macios.cs#L23

[VladislavAntonyuk]

We use the same code on Mac and iOS, it is not released yet.

[VladislavAntonyuk]

I wrote this code to make sure we don’t get duplicate file name in temp folder. I will take a look if we can write file without using temporary directory