Samsung S6/S7 Bring back "just once" or "always" option when selecting default app selection
Previously the Samsung devices would ask you once or always, but now they don't by default. Well it looks like Samsung brought back the option in a way. You just have to turn it on and next time it will ask you once or always when selecting a default app.
Go to Settings
Applications
Default Applications
Default App Selection
change to ask before setting default apps