How to flatten TryAsync, Validation, Option and Either?

[Lonli-Lokli]

I have a tricky for me question on how to ocmbine multiiple methods

First I need to load documents, make some validation over them, load assosiated user and if it exists - save to database.

As a result I was going to get EitherAsync<string, /validation error or save error/, Option>

 TryAsync<byte[]> loadDocuments = TryAsync(async () =>
       {
           await Task.Delay(1000);
           return new byte[0];
       });

       Func<byte[], Option<int>> getUserId = null!;

       Func<byte[], int, Either<string, Unit>> saveDocuments = null!;