I have read in papers regarding Perovskites, in which the authors have performed synthesis within the glove box but they are using aqueous wt% of acids like HI, HBr etc.
glovebox technique is used to protect perovskite materials from oxygen and moisture. After getting sufficient moisture from environment, perovskite materials degrades (e.g. PbI2 separates from CH3NH3PbI3 ) and this make them unstable. So its better to prepare all the solutions outside and then keep inside the glovebox.