iOS backup/sync via USB on MPWP?

WD External Drives My Passport Wireless
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No, you can’t. You need to use the My Cloud app in the way mentioned below. It does not take that long if you use the 5G signal (You heed to use 5G for video watching anyway so you don’t have stutter. So stop using the old 2,4 deadly slow wireless speed.)

Here is how to upload with no problems: (Initial upload will contain a lot of data, so it will take longer.)