ISO images can be easily uploaded via web interface but if you still want to do it “old way”, the directory where Proxmox stores ISO images is
/var/lib/vz/template/iso |
You can copy the image via FTP, SCP or you can download it directly via wget
For example
cd /var/lib/vz/template/iso wget https://download.rockylinux.org/pub/rocky/8/isos/x86_64/Rocky-8.7-x86_64-minimal.iso |