I’m new in Nextcloud i install it on my Freenas but i dont know of he storage my files on my SSD in my pc.
I hoop you can help.
Unfortunately this is the Nextcloud software forum and not the FreeNAS support forum. Due to the fact that NAS manufacturers are usually following different file system and package concepts, you will most likely not find the answer that you’re expecting here. I would therefore recommend to address your question in the FreeNAS support forum first.
Additionally you can follow one of the available FreeNAS installation videos:
If you use nextcloud look data-dir in nextcloud config in config/config.php