FWIW, if you have a lot of 'legacy' materiel, use via 'external library' function rather than loading more than a very few directly into Poser.

Link via 'library' to an item's own folder anywhere on an attached or networked drive. Poser will peek within and access the item's mini-run-time. Un-link that folder, another potential piece of clutter goes safely back into your archive...

'Gotcha' is that this only works so easily if 'external content' has its own mini-run-time. Easy enough to keep an empty 'run-time' folder tree, copy to where-ever needed, populate neatly.

If you only have eg OBJ+MTL and textures in folder, just import via file menu. Don't forget to add a tiny .txt to folder with scaling and other notes...