give the url of the existing image in the error

files/helpers/media.py

@@ -217,7 +217,7 @@ def process_image(filename:str, v, resize=0, trim=False, uploader_id:Optional[in
 				if i_hash in hashes.keys():
 					os.remove(filename)
 					if has_request:
-						abort(409, "Image already exists!")
+						abort(409, "Image already exists! " + hashes[i_hash].replace('files', SITE_FULL))
 					return None
 
 	db = db or g.db