I have attempted to uninstall the doctor container, including removing the image, but I cannot start the container after pulling it down again.

How do I access the directory in order to clear the data from the folder?

you need to delete the app data path as well. the docker creates a folder and files that persist on disk even if you remove or uninstall the docker.

please delete the bad data in the /mnt/user/appdata path or where ever you told the template and path to exist...

then follow the guide to setup and install immich on unraid:

Docker Guides:

Immich Docker-compose Setup

Immich Unraid-Template in the CA

Please post questions and isseus here...