Multiplayer Client/Host Issues

Recently got the game, and I love it; it has a bit of a learning curve, which a few already suggested QoL things could ease, but that adds to the charm. My brother recently got it after hearing me talk about it. I wanted to teach him the ropes and join his world. Right from the bat, everything looked good. We dug out of the facility, and he fixed the terminal. Trying to place down a miner and anything really after that point (assemblers, inserters, crank gens, platforms, water wheels, platers, etc.) took a while for it to update on my side. My brother said everything was being built fine for him. Transferring items in and out of my inventory also took a minute to update. At one point, I started clipping through platforms as well, and my brother was unable to interact (clipped through) an assembler.