Hello, goodmorning

Yesterday I added a picture of SU-GCP, which is recently converted into a freighter and is now a 737-866(SF)
Picture was rejected due to bad info, and the advice was given to add the type via aircraft form.
Next thing I did was to request the type via form, however it was also rejected without any comment...

Maybe it was because I did it wrong:

I uploaded it as following (see picture) was it wrong from me to choose 737-866 and then the (SF) between brackets.
Should I leave the left ticker blank and then put in the right the 866(SF) or how should it be added?

Thank you for the feedback.