I always select upload later. Get home. Open wayfarer. Open my contributions. Then open game. Click upload contributions. Then refresh really quickly to see my nominations and put them on hold.
I then edit at will 
But with Emily (the machine learning) I also make the noms with basic info. Just in case Emily gets to them in the seconds I have uploaded and not put on hold.
This process has meant I have been able to do all my homework, get the supporting info and so on.
Re the survey marker… They are are nightmare blight in some countries and there are hundreds of thousands of them if not millions…
So Niantic has addressed. And it looks to me (and I am not a fan of these) that this should be appealed. Niantic clearly state markers on mountain tops etc can make the grade … Survey Markers - Criteria Clarification Collection - Niantic Wayfarer Community but in your appeal really address the beauty of the spot importance of marker, ease of public access and include link to the above link … In the future if you find such spots focus on the view and do the marker in supporting photo (with view) and link to the government website that lists the marker (in supporting info).
Remember upload later is your friend as others have hinted. It transformed my success rate.