Galleria settings on creation only

Hello thanks for the work in this module.

I have a few question I will put in different issues to help clear things.

First : the galleria settings on a new type appears only when creating a new type and seems to be unavailable when modifying the type.
That means if we get wrong the "allow attachement" or such setting we have to delete the content, the type and recreate it ...
Hardly user friendly and hard to understand :)