What a listing needs before you send it

You need at least three photos. That is a database requirement rather than a screen one, and a listing with fewer cannot be published.

You need a price on at least one unit. For parking that is an hourly or a monthly price, and a daily price is optional. For storage you need a monthly price and a size in square metres.

Zero is not a price, and text that is not a number is not a price. The field is checked by its value, not by whether you typed something into it.

At the last step you declare that you have the right to let the space, that the information in the listing is accurate, and that you agree to it being reviewed. Without those declarations you cannot send it.