try to fix image uploading

app.py

@@ -233,6 +233,7 @@ def main(file, name, fps=30, res: tuple=(1280,720), oscres=512, sr=11025, lyrics
     if img and cover_img == -1:
         color_thief = ColorThief(img)
         dominant_color = color_thief.get_color(quality=1)
+        cover_img = cover_file
     else:
         dominant_color = getColour(cover_img)