We decided that offering a way for people to delete files was pretty dangerous. The number of users complaining and accusing Poser of doing things that were actually done by themselves is rather high. So, Poser is incapable of deleting, therefore cannot be accused of doing it incorrectly.

As to grouping files, what do you mean? You have near total freedom to organize how you like. You can move things around in Poser with drag and drop, or use your file manager.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)