Add zip function to Jinja2 globals

app.py

@@ -20,6 +20,9 @@ THUMBNAIL_FOLDER = '/tmp/thumbnails'
 os.makedirs(UPLOAD_FOLDER, mode=0o777, exist_ok=True)
 os.makedirs(THUMBNAIL_FOLDER, mode=0o777, exist_ok=True)
 
+# Add zip to Jinja2 globals
+app.jinja_env.globals.update(zip=zip)
+
 def get_watermark_position(img_width, img_height, wm_width, wm_height, position):
     if position == "top-left":
         return 10, 10