One fudamentally cannot know the mind of another. Your opinion is based on incomplete observation and assumptions. Your insistence that a digital copy isn't me holds as much weight as the assertion that you aren't real because you exist only as text on my screen.
That's the part I directly dispute.
I don't dispute that a computer could become conscious, but I'm not convinced you could transfer your consciousness to a machine. If a brain scan copied your brain, that would not be the same consciousness that you have now. It would be like having a twin, and twins don't share a consciousness.
For a technical issue I'd also add that this entire thing becoming increasingly absurd given advances in understanding of human biology. Discoveries like the gut-brain axis emphasize that the concept of brains in a shell is mostly naive. Your body and your brain are completely interdependent to create 'you'.
But again I think the objections around consciousness or possibility are completely inconsequential (if not also strong arguments in their own right). Even if we accept every single point and desired outcome, you still die.
Machine-you would no doubt be thrilled. How does bio-you cope with not being made immortal? If your answer is "It doesn't matter, throw the original in the trash" is that murder or suicide?
I find I'm actually happier accepting a little nihilism in my life, knowing that at some point, I will die, and within a couple generations of my death, I will be completely forgotten.
This isn't depressing, it's freeing. It means there are no long term expectations of me, so I should I just spend as much time as I can doing the things I enjoy.