I am having trouble with two things as far as I can tell.
First, when I try to grab an object, it works fine, but I can only mount it, I can't drop it in a new spot. I am trying to build a rover on the Mun, but my ship is too tall to be able to access the storage containers from the ground. I need to drop them, then rearrange them on the ground.
Second, I can't see the SC-62 container on my back when I am carrying it. In addition, I can't carry most items, including the EVA fuel canister. only the SC-62 and SEQ-6.