I find the way we save our renders in Poser a bit counter-intuitive. You Click on this camera thingie, it makes a render, you then, what, make a copy, and to save it you close it, but tell it you actually do want to save it after all? Seems like saving is an afterthought.

Weird.

So, I'm not surprised you've run into issues. I've never done a render as a separate process, and wouldn't have a clue where to retrieve the result of all my hard work from. Poser 9 could have a different metaphor for this, for my money.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks