You can now create a draft to submit later and edit if needed before submitting.
Creating a draft will not use a submission until you press submit so you can add as many drafts as you like as long as you have at least one submission available.
You can't do this in game only through your Wayfarer page.
Login to Wayfarer go to submit tab on the left.
Upload main photo, upload up to five support photos and add your Title, Description and Support Text like this
At the moment submitting via the web does not add your Go username to the Wayspot that's only available if you submit in game.
by 26thDoctor_