Copy sg_uploaded_movie to sg_uploaded_movie_image?

Currently, the automatic transcoding forces all videos or images to have a resolution of no more than 2048 and we really need to review higher resolution images in shotgun. Since most of the image formats we used are web-streamable, I think the best way is to “reuse” the file we upload to sg_uploaded_movie instead of uploading each file twice.
But after I tried to copy the sg_uploaded_movie to sg_uploaded_movie_image, I found the ‘link_type’ always change to ‘web’ after the data updated.
So is there any way to avoid upload, download and upload the file again(I am trying to use the event framework to make everything automatic.)?