Nguyên văn bởi ★Krako★:

no matter how many models I install in the usermod folder

You shouldn't do that. Despite its name, usermod is the worst place for installing custom assets. You should instead create your own search paths. Here's a guide on how to do that: https://gtm.you1.cn/sharedfiles/filedetails/?id=2933594402

Nguyên văn bởi ★Krako★:

the model is not there or does not appear

Do you mean it appears in the models list, but when imported it's invisible, with only its bones showing when you hold Ctrl while in motion or graph editor mode? If so, that means you installed the model in the wrong place. Check this guide out to troubleshoot it: https://gtm.you1.cn/sharedfiles/filedetails/?id=1226526147
If it's not what you mean, please explain in more detail.