change settings of off viewer

[Arihant]

how do i change pdf viewer in gmail its opening with one drive currently!! urgent

[Hpiyeja]

open one drive and clear the tick mark open default

[Addyzaccount]

settings>apps>one drive>clear defaults

[admin_]

Thanks for Being a part of Samsung community. Would like to tell you Kindly follow the steps below to resolve your concern :-
1) Navigate to apps >> Settings >> Apps >> Tap on three dots >> Reset app preferences.