In the studio, combine images interface: please privilege the 1st image

Hi. It is clear that the first image in a set is treated differently at the time of combining images. It would be nice to change/upload only the first image without touching the others (which can be up to 5 in seedream, for instance).

My workflow is usually to upload 6 images, generate, remove the images, upload 6 again, etc. However, in many cases I would like to change ONLY the first image and leave the rest as they are. It would be nice if the interface facilitates that.

Thanks.