You can upload the ISO to the organization directory in the HTML5 interface. To access the HTML5 interface, you need to add the name of your organization to the link https://vcd.cloud4y.ru/tenant/ (https://vcdfz.cloud4y.ru/tenant/ for the FZ cloud) as it is specified in the link to the FLASH interface, for example, from https://vcd.cloud4y.ru/cloud/org/org-name you get https://vcd.cloud4y.ru/tenant/org-name.
Switch to Libraries view mode
create new catalog (Catalogs/NEW)
On the Media & Other tab, press ADD, select the created directory and ISO file to download