Did you configure the correct folder in the configuration? The ‘Folder’ to be selected should have ‘portraits’ and ‘tokens’ subfolders, the images inside those (the tokens folder is actually optional).
Example of correct structure:
- /imgs/ <- folder selected
- /imgs/portraits/warrior_human.jpg
- /imgs/portraits/warrior.png
- /imgs/tokens/warrior.png <- will get the token IF found one, optional, if NOT will use portrait as the token (and tokenize if you use tokenizer)