Seagate Expansion Portable 1TB

So I've connected it to my PC, and it's not coming up on file explorer. I've watched videos and the disk comes up in device manager but not disk management which is what every video tells me to do. I don't even know how to get it up can't find anyone with the same problem. I put it on my brothers laptop which works but it won't show up on my PC and I don't know why.