Option to keep grade booster

I saw one of this wk’s OM bosses’ rewards is grade booster. All the good arks that I have are all S ranks.

Can we have the option of not using it & keep it? I haven’t claimed like 4 of my pvp gradeboosters due to this reason.

That option would be so helpfull…

Yeah that’s true because then you can have a choice to use it on arks that you might get later!

I definitely agree. We can store ocarinas, so why not grade boosters? 

They would need to code in a kind of inventory system of sorts. It would probably be useful, for future additions as well.