All of the newer MacBook Pro’s have soldered RAM & Flash storage as you can see here
[image|1805580]
The Green outlined area is the RAM
[image|1805581]
The Red outlined chips is the Flash with two more on the other side.
So no you can’t upgrade your RAM or Storage. All you can do is swap out your logic board with another one with more RAM and/or Storage. This would be a very expensive endeavor which I don’t recommend.
As your focus was storage I would look at external USB-C SSD drives to store your stuff if you already have your system. Otherwise you need to think how you are going to use your system and buy as large a storage option you can. Don’t forget the RAM side of the issue! As you didn’t tell us what your use is I can’t given you any directions on what you’ll likely need.
One last note: If you are into heavy video or music production you might want to wait a bit if you can. There are strong rumors Apple is expected to intro a 16.5” system this fall. While I don’t have direct knowledge there is a good chance this model will take a different direction going back to a more serviceable RAM & Storage.