Why is "adb sideload <OnePlus 3T Beta 10 >" giving me an error?

[Benjamin Woods]

When I type in "adb sideload <OnePlus 3T Beta 10 >" (OnePlus 3T Beta 10 being the name of the file) I get "The syntax of the command is incorrect". I have the OnePlus 3T in adb sideloading mode, and as far as I can see, everything should work. Any help would be greatly appreciated.