Change Details

I tried to upload https://commons.wikimedia.org/wiki/File:Hardcourt_Bike_Polo_game.webm with the name Hardcourt_Bike_Polo.webm, but it fails with the above error. This seems to be caused by the existence of https://commons.wikimedia.org/wiki/File:Hardcourt_Bike_Polo.jpg, and i guess the fact that thumbnails are rendered to jpg with the same file name. Not sure if it is a bug or a feature, but the error message is not clear.