When adding Addons And Recourses pack it won't allow

When I was adding a adoon to a world it wont allow me I tap several times but it won't I tried removing addon the add-on and it allows me to remove it but does not allow me to add it back . and it also does it on texture pack .it also won't allow me to add it on a new world.my phone is a Disney DM001c,Adreno