Add a class to the image

@giordy,
Can you provide the steps?
Thanks

@giordy

Can you please confirm the version of Drupal you are referring to? Based on the provided information, there seems to be a discrepancy between the mentioned Drupal version 7 and the selected version 3.0.8, which is applicable for Drupal 9.3 or higher and Drupal 10.

It would be helpful to clarify the Drupal version to ensure accurate assistance. Thank you.

I use Drupal 9.59.
Is not an error, but a request for additional functionality.
Thank you.

I'm sorry to bring the post back up, but I wanted to know if there are any news on how to insert classes to images with Drupal 11, or if there are alternative solutions.
For sites with a lot of text and many images it is very complicated to go and look for the correct line in the source code to add the class.

Thanks and best regards