gitlab-ce/doc/development/shared_files.md

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Shared files

Historically, GitLab supported storing files that could be accessed from multiple application servers in shared/, using a shared storage solution like NFS. Although this is still an option for some GitLab installations, it must not be the only file storage option for a given feature. This is because cloud-native GitLab installations do not support it.

Our uploads documentation describes how to handle file storage in such a way that it supports both options: direct disk access and object storage.