If you look in my signature under "upload your saved game folder for the devs", you should find in those instructions where that folder is. You'll want to upload that folder, the output_log.txt, and your dxdiag txt.
I'm going to put together another tutorial for just normal bug reporting when I get a bit of free time.
EDIT: That crash folder should be in your top-level Subnautica folder. Honestly, if I were you, I'd just follow the directions for uploading your saved game directory, and just not include the slot000x directory (but it wouldn't hurt if you did include it, it would just take a little longer to upload).
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I'm going to put together another tutorial for just normal bug reporting when I get a bit of free time.
EDIT: That crash folder should be in your top-level Subnautica folder. Honestly, if I were you, I'd just follow the directions for uploading your saved game directory, and just not include the slot000x directory (but it wouldn't hurt if you did include it, it would just take a little longer to upload).