App for Samsung S5 phone

Caan not get my Samsung S5 to connect to my cameras
Any help

I have a Samsung S7 and the app does “work” with mine but I have to go get my wife’s S8 phone in order to set up bulbs because the S7 will just not work no matter how I try.

I found that the app no longer works fully with my s4.

Seems to work fine on s10 and s6.