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To use the service it is necessary to log in with you valid institution credentials to AcademicCloud.
Collaboration with a user without a valid account is possible with the "Link-Sharing" function.
You can read the official manual for the Layout LaTeX documents (ShareLatex) service online.
Q: Does Overleaf offer git or dropbox integrations?
No, unfortunately the manufacturer reserves this for his cloud service: https://de.overleaf.com/for/enterprises/features
Q: Is there a limit on the number of collaborators?
There is no limit upon the number of collaborators per project.