updating ipad through itunes 12.13.4.4

I usually update my ipad through my computer because I never have enough storage to update, but my ipad does not show up in the updated itunes 12.13.4.4 when I plug my ipad into my computer now. Has anyone else run into this issue. I have tried multiple cords, so it is not the cord. My ipad charges through my computer, but will not show up in itunes.