Recently I got myself a generic selfie stick. The selfie stick has got a connector that connects into the headphone jack of the phone. My phone is a XiaoMi Mi F1 Pocophone.
After plugging in I noticed when I press the button on the selfie stick, it will take timer shots instead of just a normal shot. I want the selfie to be like when I press the selfie stick button the phone camera will immediately take a shot instead of using timer shots where I have to wait a few seconds before taking the shot.
The setting is at settings -> volume buttons function select Shutter instead of Shutter countdown.
This issue does not seem to affect those stock android OS like the one in MiA1, MiA2 phones.