The protocol states that it will upload the Diagnosis Keys, a set of Daily Tracing Keys relevant to your exposure. So in short, if this is the case it forces the user to either upload all their keys or none.
I would like to note that a v1.1 has recently been released, my information is about v1.0.
I would like to note that a v1.1 has recently been released, my information is about v1.0.