I am finding even choosing Textra as a default, it disables features/connectivity normally with Samsung default messaging. Therefore, with Textra, I can't get notification sounds to work when receiving a message unless I turn Textra off, nor will it enable MMS (video or picture) . Nor any of the "share" features in other apps. Textra is not actually behaving as a default should in replacing the existing in-built messaging one, so keep having to turn it off and really Samsung. If it really did replace the S6 inbuilt app and connected to other services I would pay for Premium version just as I love the dark theme for my visual disabilities. However, at half the function I wouldn't risk buying it. Unless I am doing something wrong?