Do you have any folders shared from your windows 10 computer with permissions set to "everyone"? "net use" always works for me on 98SE when other options are failing.
Let's say for example you share a folder and call it "Movies" and your Windows 10 computers IP (local) is 192.168.1.4. (I'm assuming both computers are connected to the same router in your home, without any special networking setup)
once you do that open up command prompt on Win98 (or make a batch file) and enter: net use X: \\192.168.1.4\Movies
**where X: is the drive you want to mount it is, if you enter the above line, you should now have an X drive named Movies in my computer.
If you need help sharing a folder on win10 and setting permissions just ask, or google will turn up tons of tutorials.
Also: Is the usb drive NOT WORKING, or is it just not reading flash drives? you need to either install windows 98 SP3 (unofficial service pack) or just download "nusb33" for your version of windows 98, though you'll still need to go over the network or burn a CD to get it going.
Sup. I like computers. Are you a computer?