How do I rotate an image?

Bug Reports
6

I ran into this as well. The man page Anvil Docs | Image Manipulation has the same issue.

icon = URLMedia('https://cdn.vectorstock.com/i/1000v/55/34/om-sign-vector-22855534.jpg')
w,h = anvil.image.get_dimensions(icon)
print(w,h)
small_icon = anvil.image.generate_thumbnail(icon, 16)

Yields:
RuntimeError: Cannot rotate image from untrusted cross-origin source.