Recently, I have migrated from a Synology NAS to a Ugreen NAS.
The Synology photo app was able to read the metadata of the photos (or xmp files) and provided in the smartphone app the functionality to search for images using tags. Currently, Ugreen does not provide this functionality.
I have roughly 100k photos with custom tags assigned (location, subject etc.). I’m using Digikam for indexing. Searching based on tags while traveling is quite essential for me. The AI based indexing provided by Ugreen is not a solutions. It’s not capable of identifying plants and animals with sufficient accuracy.
I’m looking for a photo app that runs in Docker on the Ugreen NAS that is capable of reading the tags and use them to search for photos. Any ideas?
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You should check out immich.
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Sorry, I should have mentioned it. I have tried Immich. Immich does not seem to support tags (or I was too stupid to use Immich in the right way).
Seems like immich supports it: Tags | Immich
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So, it seems that I was too stupid 
I’ll give Immich another try.
Thanks a lot.
I just reinstalled Immich. The tag based search works nicely.
Thanks a lot.
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Lovely, hope it works well for you. I’m eager to try it as well.
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+1 for Immich, and best of all, they have finally released the first stable version. There was never a better time to install it. Do note that I’ve been using it for a year+ and it never had an instability, its quality software.
I’m gonna start saving 5-10€ per month (what it would cost me for Google photos or whatever) and then buy their “license”.
I like how they are AGPL, and having FUTO funding them is reassuring in that there might be dedicated developers working on it for the near future at least.
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Immich now keeps the CPU of my NAS busy. Generating thumbnails for the 193k images in my photo library. Still 120k to go. Also the tag list is building up step by step. So far no issues.
Again thanks for the tips.
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thumbnails are expensive! 
I heard amazon will have huge deals for thumbnails during cyber week.
Aliexpress provides them in bulk. Although, the tags are a bit harder to read. 