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---
type: reference
---
# User File Uploads
Images that are attached to issues, merge requests, or comments
do not require authentication to be viewed if they are accessed directly by URL.
This direct URL contains a random 32-character ID that prevents unauthorized
people from guessing the URL for an image, thus there is some protection if an
image contains sensitive information.
Authentication is not enabled because images must be visible in the body of
notification emails, which are often read from email clients that are not
authenticated with GitLab, such as Outlook, Apple Mail, or the Mail app on your
mobile device.
>**Note:**
Non-image attachments do require authentication to be viewed.
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