firebaseStorage.cs

// Get any Stream — it can be FileStream, MemoryStream or any other type of Stream
var stream = File.Open(@"C:\YourFile.png", FileMode.Open);

// Construct FirebaseStorage with path to where you want to upload the file and put it there
var task = new FirebaseStorage("your-bucket.appspot.com")
 .Child("data")
 .Child("random")
 .Child("file.png")
 .PutAsync(stream);
 
// Track progress of the upload
task.Progress.ProgressChanged += (s, e) => Console.WriteLine($"Progress: {e.Percentage} %");

// Await the task to wait until upload is completed and get the download url
var downloadUrl = await task;