I have a Nikon D3200. I would like to use Lightroom to tether the camera, but Lightroom is not detecting it. Can I tether my camera to Lightroom?
You cannot tether Nikon's D3xxx series cameras to Lightroom. Adobe doesn't list any Nikon D3xxx cameras in its list of tethered cameras supported by Lightroom.
This not a fault of Adobe's; rather, Nikon's SDK (which is used by 3rd parties and partners to interact with Nikon's cameras) does not support D3xxx cameras.
See these other related Photo.SE questions for more information, and perhaps alternatives (such as TetherTools):