Since we're measuring the current connection class by monitoring traffic in your app we need a decent amount of traffic before we can get a good sense for how fast your current connection is. Since uploads are few and far between in most apps, we just haven't found a need to add this functionality. If you need it for your application, it should be pretty trivial to add in the same way we've measured and calculated the apps current downstream bandwidth.
Since we're measuring the current connection class by monitoring traffic in your app we need a decent amount of traffic before we can get a good sense for how fast your current connection is. Since uploads are few and far between in most apps, we just haven't found a need to add this functionality. If you need it for your application, it should be pretty trivial to add in the same way we've measured and calculated the apps current downstream bandwidth.