Package and Read Asset Files in .NET MAUI

Place the files to be packaged in the Resources\Raw\ directory.
Set the file’s Build Action to MauiAsset.
Use using (Stream instream = FileSystem.Current.OpenAppPackageFileAsync(fileName)) to read the file.

Copy the file to another directory.

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// Open the source file
using Stream inputStream = await FileSystem.Current.OpenAppPackageFileAsync(filename);

// Create an output filename
string targetFile = Path.Combine(FileSystem.Current.AppDataDirectory, filename);

// Copy the file to the AppDataDirectory
using FileStream outputStream = File.Create(targetFile);
await inputStream.CopyToAsync(outputStream);