Doawload images commcare in excel

Hello Dear CommCare Users. I have a project where the data contain photos (vaccination cards) and consent signatures. After downloading the data, I have the links that direct to the images.
But when I click, I am asked for a username and password.
If I use the user name of my account and the password, I can not display the image.
What if I see the images from the Excel file ??
Learning with CommCare is just continuing !!!

Very cordially