I think it's up to you to upload the data? It seems like it depends how the app is designed. The protocol doesn't specify it.
I would like to note that a v1.1 has recently been released, my information is about v1.0.
The ENSelfExposureInfoRequest class can be used by an app to obtain diagnosis keys for the previous 14 days. What an app does with those keys is up to whoever implements it.
https://covid19-static.cdn-apple.com/applications/covid19/cu...