Genesis 3 is not really Poser-compatible - there are ways to bodge them in, but they lose features in the process.

For the rest, content with Poser Companion Files should load as long as both the PoserCFs and the DSON Core (native DAZ Studio) files are installed to a Poser external library (the nearer the top of the list the better). Having the content appear to load but then not come into the scene usually means the Data folder with the geometry definitions is not in a Poser library folder.