Conditions for Use of Image Generation Functions for AI Characters

Sorry for the continuous posting! This is the last one for today.

Regarding the "image generation" feature for AI characters added in the V2.1.8.1 update, I would like you to specify the conditions under which it is available (or is it already written somewhere? Sorry, we could not find it here).

I personally have a character that I would like to use the image generation function, but the "image generation" function is not available for about half of the AI characters I have created, and the cause and conditions for this are still unknown. I would be very happy if you could explain the conditions under which "image generation" can be used in some way.

I apologize for posting a series of feedback at a time when you are very busy. I started out using Seaart just for my personal enjoyment, but recently I have received many "favorites" as well as warm comments, and I am enjoying using Seaart very much. I hope you will take your time and consider us one by one. Thank you very much.