Thanks. I've actually tried this before, and I tried again just now.
But unfortunately it doesn't seem to work, I go into the same place in-game and its still blank with no option to add a side emblem.
Side note: Ive been playing the campaign a bit today and unlocked a flotilla side emblem? So the option for a side emblem it is there now but its only showing that one flotilla emblem that I unlocked with a medal.