Javascript code for tracking which was incorporated into Joomla installation through a Custom HTML module has no effect on Piwigo gallery. How visits to the gallery could be tracked, i.e. where the code goes in it?
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Piwigo is completely external to Joomla. You will need to put the tracking code directly into Piwigo. You may want to contact the Piwigo to check if they have a plugin for analytics.
