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Here is a better USB supplement than Microsoft's original work: https://msfn.org/board/topic/177518-xusbsupp-extended-usb-supplement-for-windows-95-osr2/
USB mass storage-class device drivers are built in.
"Windows 95 Service Pack 1" is the incomplete update only, missing all of the tools, add-ins and other updates.
Here's the complete SP1: https://drive.google.com/open?id=1wOMonvFFX1EV2EJQx9FznsQrihtE0t7k
https://msfn.org/board/topic/177518-xusbsupp-extended-usb-supplement-for-windows-95-osr2/ is down :(
Here are 2 mirrors to the file: http://lonecrusader.x10host.com/files/XUSBSUPP.ZIPhttp://www.tmeeco.eu/9X4EVER/GOODIES/XUSBSUPP2.ZIP