I was in Kuching quite some time ady... wanted to travel to visist "James Brook's" yard but couldn't locate it on the app as it wasn't tagged..

Have to type in the address, and use the pin to pin point the drop location.

For ulu places, you will need to be familiar with the map location, only then you can point it on the Grab app... Yes... its a hassle and non-intuitive for new users/unfamiliar users.