K8s volume , upload file in to it

Hi, i'm new using this solution of k8s by ovh. I have a questions about how upload files inside a pv.
i',ve create a pvc, and i mount it in pod , but now i need to put some files inside the volume.
How can i upload this file in to the volume? I'm using the standard storadge class, i some external nfs storage class for upload some file?
Thanks in advance.
Davide Castracucchi