The three types look alike and often get used interchangeably. That usually works, but not always: a sheet that is too thin for a generous filling tears, and a sheet that is too sturdy for gözleme turns tough. Here is what to watch for.
Yufka without preservatives dries out as soon as it stands in the open air. That is not a flaw but a consequence: there is nothing in it that holds on to the moisture. A few habits keep it good for days.