If i press the RTH while the spark is disconnected from the app then will the RTH still work? Say I am using a controller with a phone and the dji go 4 says my spark is disconnected, can it still RTH?

if the AC is disconnected pressing the button will not do anything. but it should rth by itself

Spark will RTH couple of seconds after the connection was lost.

Hi, there. I would recommend you read RTH in user manual for more info. It describes how it works. Thanks for your support.