iCloud Storage

Hi,

I would like to share the same desktop and documents folder on my Mac devices. The steps I've followed are:

System Preferences

iCloud

iCloud Drive Options

(Select) Desktop & Documents Folders

It worked fine on my laptop. Now, when I do this on my iMac, it prompts me to pay for storage and doesn't give me the option to select 5Gb or skip this step all together. Storage is also not a problem since I've only stored 500 Mb of the 5Gb that are free on all devices. Is there anyway to bypass this prompt?