When I try to add a picture which already exists in the project I get the error message that this is not possible.
Please change this into a question whether you want to replace the existing files or not.
Why do we need this. When our solution gets a new UI (e.g. we change the css) we would like to update the pictures of screen shots that we have added to our documentation.
To streamline this process we have numbered all our pictures and we can than easily find out which pictures need to be replaced by new ones.
At the moment I have a work aroud: delete the existing pictures and add the new one with the same name.