Currently, when copying elements from one project and pasting onto another, Webflow will automatically duplicate any classes that already existed and keep those on the elements instead.
For example, let's say in both projects A and B I had a class called "galleryImage" that was set to many images. If I copy the images in project A and paste them onto project B, Webflow will automatically create class "galleryImage2" and apply it to the images I pasted.
Since there is no way to batch-replace classes, removing these "galleryImage2" classes from all images and then cleaning up the project is really bothersome.
My suggestion: let the user decide what to do.
Upon pasting, a dialog should ask the user what do next:
1. Default - Create copies of every class that already exist so there is no conflict
2. Replace classes on current project with classes being pasted if they have the same name
3. Keep classes on current project, applying them to objects being pasted if they have the same name.