.oo4 saving as .oo3 filename?

Im running oo4 4.6.1 (v177.7.13 r272219)

When I save it saving as oo3. I’m also using ios.

Any Idea on whats happening and am I loosing features?

v4 uses an extended version of the v3 format and has the same .oo3 extension. You are saving in the correct format.