I've found a few different options. The best was Koken but unfortunately it's abandonware

http://koken.me/

http://piwigo.org/

https://lychee.electerious.com/

https://www.thregr.org/~wavexx/software/fgallery/

https://coppermine-gallery.net/

http://sigal.saimon.org/en/latest/

https://www.zenphoto.org/

http://bpatrik.github.io/pigallery2/

https://photoprism.org/

I built a pretty simple photo blog on top of Hugo, though the layout is more Tumblr than Flickr.

Source code: https://github.com/bndw/len.to

Website: https://len.to

If you’re capable of some PHP and CSS development, the Kirby flat file CMS would suffice.

- Easy to install on shared or dedicated hosting.

- Easy to upload photos.

- A post could be a photo or album of them.

- If you know CSS you can easily make minimally designed pages for single images or whole albums.

- it’s been a while since I looked at the API, but you should be able to tag them and then display photos by tag. Barring that, it’s very easy to do that for individual posts

The closest to the ideal I've known so far is Koken [1]. Sadly I can't see any development or maintenance updates since 2017 and it's not open source [2].

[1] http://koken.me/

[2] http://koken.me/eula.html

Thanks. Unfortunately it's definitely abandoned. It looks like it was sold in 2015 to NetObjects and there's been basically no development on it since then and no support responses or updates. Very sad as it looks like a great app. I wish it was open-sourced

filiocorp.com

you can make your account on the website, create albums. And add photos from the mobile app to the respective albums.

Not self-hosted and not a photo blog