Take care with FBX imports: static models are usually okay, though scales may vary remarkably. Rigged FBX figures are 'pot luck': Some good, many sad, a few crash Poser. Beyond scaling issues, Poser may lose rigging root, so figure arrives as multiple sub-rigs. Sometimes, these may be wrangled, posed...

Generally, the older the FBX version, eg 2016 (6.1) vs current (7.4+), the more likely that rig will work well. There are honourable exceptions.

IMHO, FBX handling should improve as Poser transitions to 'Unimesh' rigging...