does post processing stack work on android and simple depth of field doesnt show in mobile

i have kept the post processing stack on main camera and applied only a depth of field and it all works fine in the editor but when it comes to android device it just doesnt show any of the effect. please tell me what to do and also help me what steps should i take to reduce the draw calls (20 draw calls are made with this effect) please help me fast

I guess you need to enable auto graphics api to get the result.
Generally android 2.0 and Vulkan looks like not supported so let you simply switch to auto graphics api and check the result.