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If you have at least two unused drives left, we are now going to dedicate one drive to uploading operating system ISO images to it. We recommend using a relatively “small” hard drive, let’s say 60 to 256 GB. This should be plenty for all your ISO files.

An album with all screenshots of the following steps can be found here: https://imgur.com/a/TGEFY1I
Navigate to Datacenter > pve.
Next to the “Disks” option there should be a little arrow to expand the menu, like shown here (https://imgur.com/5xXu4sE). Make sure to expand the menu. Then navigate to the “Directory” menu that becomes visible.
We are going to create a directory on one of the two unused disks to upload ISO images to. Click on “Create: Directory”.
A pop up should appear with several settings. Let’s talk about all of them.
Expand the menu on “Disk:”. This should list all unused physical hard drives in your system. Choose the hard drive that you want to use to dedicate to ISO images. (https://imgur.com/jt6PGI9)
For this tutorial we are going to skip the “filesystem” option and leave it on the default. In our case this is “ext4”.
Give your disk a name so you can easily recognize it. You will see this name appear in several places throughout Proxmox. I will name it ISOs. (https://imgur.com/UvgkxkH)
Make sure to check the “Add Storage” option.
Click on the blue “Create” button.
You have now initialized your hard drive to upload ISO images to. You should see your storage entry appear in the main Proxmox menu on the left. (https://imgur.com/0SYLC7f)
You can upload ISO images to this drive by clicking on the storage entry with the name you just created, then going to “Content”, and then pressing “Upload”.
(https://imgur.com/eJqRcT1)