I need some help with the Function to_image

Hi Everybody,

I'm still trying to change "%" to an image in a specific field in my template.

I tried the following :

in script :

replace_opp := replace@(match:"%", replace: to_image("opp.png"))

in game :

card field:
    type: text
    name: rule text
    script: value := replace_opp(value)
    description: opportunites ouvertes.
    multi line: true

When I launche MSE and open a new set with the template, I get this message :

"Can't convert from image to string in function replace_opp while updating card value 'rule text'

I don't understand, isn't the function to_image supposed to convert a string to an image ?

Any insight would be great !

Thx in advance