Data bucket doesn't work in private instance

I have an Arduino system to stream sensor data to the server, and it works perfectly in the dashboard, which means that I can observe the change of sensor values in real-time.
With the free account, the performance of data bucket is limited and it can only record one data per minute, so I decide to move to a private instance.
I set up my instance following the documents: Cloud - Documentation , and try to develop the data bucket as what I use in the free version (Refresh mode: stream by device), but I cannot record any data although my dashboard (on the private instance) can show the real-time changes of the sensor value.
I am not sure if I need to change any settings of the private instance, and I cannot find the control panel for the instance neither.
Does anyone know how to solve this problem?