I mean, even if we manage to find a way to upload/download memories, we currently have no way of knowing whether the receiving brain will even be the same person, or even have the same thought processes and behaviors.

I am extremely under qualified to explain neural processes, but from my understanding, memories are stored and retrieved through neurons physically forming synapses. Additionally, like our fingerprints, the anatomy of our brains is unique to each individual, which further complicates any physical processes through which we could force a brain to "remember" artificially stored memories. Theoritically, through the right stimulus, you could coerce a brain make memories, but since each brain is anatomically different, there is no guarantee that the memories would be the same, or even stored in the same manner, or place. Heck, the receiving brain may have its own ego and be a unique individual altogether with the ability to just recall the memories that were injected into it. There is currently no way of knowing what will happen until it actually happens.