Oh, I see, that's great that it can't be submitted from a thread twice, didn't know that.
Since I do upload a lot of my own, some of mine may be proposed from threads too. I thought if something written like in red, suggesting they click the entry first, which is the step I have been doing out of habit, they can see if it hadn't already been added to the database by the photographer. For me, that has happened in a few cases already. It also helped me when I saw a discrepancy between an image already in the database and the proposed one. I then knew one or the other was incorrect.
