Help with transferring games between internal and external drives

Hi everyone,

I have just bought a Seagate 2tb external drive for my xbox one s.It is formatted for games and is ready to go.

However when i transferred a 360 title from internal to external drive,the game still showed on internal storage.

I selected internal storage and selected "manage game" and selected uninstall,but it also removed it from external drive too.

Is there something i'm doing incorrectly?.Any advice is greatly appreciated

:)