Hi,
it depends where and how you include elements,
e.g. when an <plugin> or <hotspot> element is defined inside a <scene> element,
then it should be there and working,
but when defined outside a <scene> element,
then it would need to have keep="true" set to avoid getting removed,
note - in the default vtour templates the first action call is to call loadscene() to load the first scene,
and when loading a new pano/scene all current <plugin> and <hotspot> elements without keep=true will be removed,
so just add:
<plugin ... keep="true" />
see also:
https://krpano.com/docu/actions/#loadpano
https://krpano.com/docu/xml/#plugin.keep
best regards,
Klaus
Thanks Klaus,
It works the way I wanted! Thanks for your help! 
I just did a few tests and I got what I wanted once I inserted these lines just before each </scene> tag
<plugin name="mask" url="darkmask.jpg" blendmode="multiply" width="100%" height="100%" enabled="false" />
<plugin name="logo" url="logo.png" align="center" enabled="false" />
<plugin name="copyright" url="copyright.png" align="rightbottom" alpha="0" enabled="true" onclick="openurl(http://www.mywebsite.com,_blank);" />
<events onloadcomplete="tween(plugin[mask].alpha, 0, 1.0, default, removeplugin(mask));
tween(plugin[logo].alpha, 0, 1.0, default, removeplugin(logo));
tween(plugin[copyright].alpha, 1.0, 0, default);" />Best regards,
vik3d
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