Error 403: AccessDenied for thumbnail png file
I am embedding applets using this method:
in my page looks like this: https://complex-analysis.co...
But I keep getting an error of a missing thumbnail for the applet when I add the option:
Error says in Safari Mac latest OS: Failed to load resource: the server responded with a status of 403 ()
See image below.
In other page of the same site, it works fine:
Am I doing something wrong?
Any advice would be appreciated? Thanks.