i have these methods to backup my sqlite and upload it on my blob container

public static async Task<string> CreateBackupAsync()
{
    // Generate the timestamped backup file name
    var timestamp = DateTime.UtcNow.ToString("yyyyMMddHHmmss");
    var backupFileName = $"backup_{timestamp}.db";
    var backupFilePath = Path.Combine("C:\Backups", backupFileName); 

    // Ensure the backup directory exists
    Directory.CreateDirectory("C:\Backups");

    using (var location = new SqliteConnection($"Data Source={LocalDbPath}"))
    using (var destination = new SqliteConnection($"Data Source={backupFilePath}"))
    {
        await location.OpenAsync();
        await destination.OpenAsync();
        location.BackupDatabase(destination);
    }

    return Path.GetFullPath(backupFilePath); 
}

public static async Task UploadFileAsync(string filePath)
{
    var containerClient = new BlobContainerClient(new Uri(ConnectionString));
    var blobClient = containerClient.GetBlobClient($"database/backup/{Path.GetFileName(filePath)}");

    try
    {
        // Upload the file to Azure Blob Storage
        await using var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.None);
        await blobClient.UploadAsync(fs, true);
    }
    catch (Exception ex)
    {
        Debug.WriteLine($"Exception: {ex.Message}");
        Debug.WriteLine($"Stack Trace: {ex.StackTrace}");
    }
}

in my program

var backup = await DatabaseSynchronizer.CreateBackupAsync();
await DatabaseSynchronizer.UploadFileAsync(backup);

when the code reach

await using var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.None)

i have an exception of type

System.IO.IOException: 'The process cannot access the file 'C:...Debugnet8.0-windows10.0.19041.0backup_20240702114910.db' because it is being used by another process.'

the mentioned file is locked until i shutdown my app.
i cant find a solution to this