Android is all about choice: like the option to use different apps for different things, or to change apps with one tap. But on the Galaxy S8 (and S7 running Nougat), Samsung changed the option to launch specific apps “just once” and automatically make them the default choice.
The thing is, that doesn’t work for most people. For example, if you don’t want to open a certain type of file with the same app every time (like when sharing), you’ll want to see Android’s default app picker every single time. That just makes sense. On Samsung’s Nougat, however, you’ll see the app picker once, then your selection will become the default.
The good news is that there’s a way to change this option so it will ask you each time, and let you choose to open an app just once, or make it the default—you know, the default Android way.
To get started, pull down the notification shade and tap the gear icon. Then scroll down to “Apps” and tap into that menu.
Tap the three dot button in the upper right corner, then select “Default apps.”
The fourth option in this menu is “Default app selection.” Tap that, then select “Ask before setting default apps.”
From this point forward, you’ll see the app picker dialog each time you try to do something that doesn’t have a default action already set. You can then choose to perform the chosen action just once, or set it as the default.