Cannot unhide objects (ALT+H does not work, not in Local view)

Support Basics & Interface
1

The title pretty much sums it up. I’ve tried object and edit mode, ortho and persp. Help?

2

Too little info provided, please post the .blend file so we can examine it.

3

You can only hide / unhide those objects that were visible when you went into your local view while in local view. You cannot add hidden objects to your local view

So if the objects are not in your local view then you can’t hide or unhide them