[PROBLEM] Cannot set up USB hard drives

[Cymbal Monkey]

Very Top right when you select update or regen should be a small ' arrowed spinner'  Is that present?
If it is then wait until it completes and disappears. Then the update will have completed.

However, I think your problem is as reported by the error you quoted    " I get a message that says "share cannot be left blank"

That does appear, and then disappears, and when it disappears nothing has changed.