If your content was rejected with “Editorial Designation - This content can only be accepted for editorial use. Please select the “Editorial” button before submitting” it is most likely because it was not correctly designated as editorial during the submission process and was submitted for commercial review instead.
Editorial content must be designated as “Editorial” when preparing it for submission on the Submit Content page.
Here are some additional resources you may find helpful:
If you don’t understand the reason for the rejection of your images or if you need additional clarification, you can always contact contributor support.