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How to build a joomla gallery with jsn imageshow 
Get to know what is a showlist : 
Showlist stores information about images to be presented in gallery. Jsn imageshow is able to connect to multiple image sources and use images directly from there. Image details like title and description are also used from the original source, so you don't need to bother reconfiguring them again.
You can create multiple showlists connected to multiple image sources. In the back-end, go to components-] jsn imageshow-] showlists.