Ernest,
I apologize for the slow reply. Envira Gallery was not my support tickets. So, I had to contact them via a different method. Included below is the pertinent part of the exchange I had with Envira Gallery.
Thank you,
Larry
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Me: Ajax Support asked how the Envira gallery image tags are stored. Are they stored as taxonomy terms or some other way?
Envira: Our tags are custom taxonomies
Me: My understanding then is that like other tags in WordPress they can be used for grouping related content or used as a filtering / search mechanism. They are custom in the since that by default, images in the WordPress media library don’t have tags and Envira adds them as a taxonomy.
Envira: To the best of my understanding, after having shown a developer your ticket, you’re correct; I’ll add that Envira does not provide a template for taxonomy archives, which may or may not have an effect on what you’re shooting for.