When editing an observation, please move up the button that allows you to re-order the photos closer to the media window. I upload multiple photos at a time typically and sometimes want to move the photos around to choose the most appropriate thumbnail after submission.
The button is too far below the media window and easy to miss. I actually had to search the forum to see if it was possible to rearrange them since I couldn’t find it.
Alternative: Remove the button altogether and make a simple UI function where you just drag the photo you want to move in the media window to be in front or behind the current photo.
*screenshot and diagram provided by user jeanphilippeb