Can't get the TRANSMISSION_WEB_UI variable to work

[astaplet]

Hi there! I'm running this image in the container manager on a Synology device. I had been running on an old version of the container for several years in which I'd manually installed an alternate UI. I recently updated to the newest version of the image and can no longer get alternate UIs to install manually, but the environment variable discussed in the documentation doesn't work for me. I've copied and pasted it exactly and yet I always end up with the default web UI. Has anybody else encountered this issue?

[benyjr]

Can you paste how you are invoking TRANSMISSION_WEB_UI?

I use docker-compose and use the following line:

  - TRANSMISSION_WEB_UI=transmissionic

[astaplet]

I'm running it via the container manager on my synology, so all the environment variables are simply set in the UI as seen in this screenshot. Everything else works correctly, it's only the web ui that doesn't work.