Uploading Multiple Model Releases

Hi guys. I have a question about uploading multiple model releases. First I uploaded photos without any releases knowing I can add those later. After rejection I went to hidden files tab and edited those photos by adding the relevant release to it. All good when only one person present. When 2 or more people on the photograph I run into a problem - could not find a way how to add multiple releases to one photo. Even tried to put all releases in one folder and make a zip from it but got an error message after uploading. Anybody knows and could please?