I would support this feature. I do occasionally encounter PSDs of images that I would like to store in Szurubooru.

Just a note that I've continued to try to implement this on and off, and the only blocker is szurubooru having way too many dependencies, they have hard to solve clashes with psd-tools which for some reason is the only piece of software on the Internet that will allow a python application to merge all visible layers and output a thumbnail.

My next attempt will probably trying to make a subset of psd tools' and its relevant dependencies' code in a mini-library just for szurubooru to use... but that will take a while so if anyone has a better solution, please, use it.

My attempt worked (or it helped me try things out faster until I was able to switch out the mini-library anyway), @nosyrbllewe feel free to use my fork until this is merged (if it ever is).

Thanks for pinging me. I will consider using your fork.