Is it possible to release a record button in DJI Mimo application (in video or photo mode) using Bluetooth connection to Android phone from external bluetooth trigger (for example from selfie-stick with bluetooth microswitch).
It works with my Samsung Galaxy s8 phone making photos or videos in internal apps.

You can fire the shutter button using the Memo app as long as the camera has the Wifi adapter. There are some other set ups that connect the camera to the wifi and the phone if you want to do it that way. I suspect the DJI stick will allow this should they decide to release it.