Topic on Extension talk:AdaptiveThumb

http://moscowamerican.com/wiki/Test

The coding disappears, but there is no picture!

<pic src="Screenshot of unknown america video rentv 2020 youtube (Smaller).png"/>

correct, I just reproduced it. You have to add

wfLoadExtension ('adaptivethumb');

not

wfLoadExtension ('AdaptiveThumb');

Avoid the CamelCase and you'll be good

sorry I did not get informed about your inquiry and let you wait 7 months. Is the picture available from your server's root directory? I wrote http://try-linux.blogspot.com/2020/10/a-new-look-for-linuxintroorg.html which contains configuration examples for nginx.

most probably you have an old version where you still need to set $wgAllowExternalImages=true; which is a security issue, sorry