
Hi @Sajith Gopalakrishnan Hema ,
According to my research, Idle Session Timeout in SharePoint Online is disabled by default. After opening, it also reminds that the account will be Signed out, not the files and folders are disappearing as you described. For more details, you can refer to this article.
So I think your problem has more to do with OpenText Documentum Connector. It is recommended that you go to the forum of OpenText for better help.
Thank you for your understanding and support.
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Regards,
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