Everyone please join me in welcoming the PhotoPrism team to the forums!
I’ve set them up a category with the other Software projects:
https://discuss.pixls.us/photoprism
And of course their account is @photoprism_app.
If you haven’t had a chance to see what they’re up to you might be pleasantly surprised at the features and work they’ve accomplished this past year:
https://discuss.pixls.us/photoprism
Welcome aboard! 
Great to be here! 
Happy to discuss general questions and help with technical issues on https://discuss.pixls.us/photoprism
Hi @photoprism_app nice to hear about your incredible softare which I never heard of before. Unfortunately I was not able to raise a new topic under the above-mentioned URL, so please don’t mind if I ask my question here. And feel free to move it to the new board 
As I studied your quite impressive feature list on your web site, I was wondering if the photos are auto-tagged by AI-based analysis of the photos itself, or if tagging is “just” based on the meta-data included in the JPEG or sidecar file. Unfortunately I didn’t find more information about this on your web site, but perhaps I just overread it…
So any links to the documentation or comments are appreciated 
Well darn. I’m looking into this right now to figure out what’s going on - sorry for the delay!