Views Slideshow Contextual Filter, Show Images From Same Node
To add a contextual filter for Content:Node:Nid, configure the 'When the filter value is NOT available' by selecting 'Provide default value, and under 'Type' select 'Content ID from URL'.

Save your view and you are done.

In your case, check for the nid or entity id associated with the attached (associated) images, and relate this to the node id in the URL. If your base table is node, the Content:node:nid will work. If your base table is files, you will need to use File Usage:Entity ID.