i have a business process from 18 user tasks with the same form that has a upload button from web access, when i run the business process and upload only * 1 image * from web access and press submit, and open the next user task and click on the link of image it opens directly with no problem until the process ends . but when i upload more than * 1 image * from web access and press submit, and try to open the images in the next step, web access iframe opens and ask me for username and password for the Repository, and when i enter them, web access open the repository not the image i uploaded from the previous user task. i don't know this happens ? 

*i use an administrator account to run the whole business process*