combined_image -> combined_image_path

app.py

@@ -107,7 +107,7 @@ async def deepfloydif(ctx, *, prompt: str):
         thread = await sent_message.create_thread(name='Image Upscaling Thread')
 
         #4
-        with open(combined_image, 'rb') as f:
+        with open(combined_image_path, 'rb') as f:
             threadmsg = await thread.send('Here is the combined image. React with the image number you want to upscale!', file=discord.File(f, 'combined_image.png'))          
             
         # bot reacts with appropriate emojis to the post, both showing the user what options they have,