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Hi Sebastian,
Thanks for posting in the community. We are happy to help you.
According to your description, my understanding is that you can't create any Office files on the SharePoint site.
- If not, please point it out and provide more details about the situation.
- If so, this can be caused by many reasons, such as the browser or the server. I would like to gather more information to troubleshoot it.
- Please open the InPrivate browser window, access the SharePoint site, and test again.
- Does the problem occur in a specific site/library? Please go to another site/library, create a new file, and check again.
- If you have Office desktop apps, please create a new file and save it on the SharePoint site. Check if the save was successful.
We look forward to your response. Thanks for your cooperation.
Sincerely,
George | Microsoft Community Moderator