Originally Posted by ldo58
I uninstalled and reinstalled, but it didn't help.

So the other partymembers have no inventory. Pushing the inventory button, n, They are shown in a screen like any monster would.
They cannot pick up or loot items, only the player can do that
The player cannot transfer items to other teammembers

Playing the campaign like this is impossible .

It's only this way in the opening on the Nautiloid. The game is treating them as not really being in your party.

It changes on the beach after the Nautiloid. You once again have access to your companions' inventories, and you can use them to pick up items.