That is... far too little actually. GW is about 1+GB in size and Android inherently falls apart once you reach storage spaces of 3GB-below. I'd recommend getting at least 5 or 10GB.
Also, having that LITTLE storage on an S21 of all things is WILD.
Weeeeeeeeell... that's quite unfortunate XD
Also had no idea the device operates worse with under 3GB. It's seems to operate alright for me even with under 1GB available. Storage is really hard to manage for me honestly. It seems like I just download too many things and it builds up and then I have no storage available. I don't think my phone has access to SD cards.
Weird that devices don't operate in a way that allows you to use its full storage and still operate properly XD