Word, Excel files lost all content and were inserted a piece of code when stored on NextCloud server

I am having a very annoying error while using Nextcloud

I searched on Google a lot of keywords but had no answer

Recently, the word, excel files stored on NextCloud server lost all content and had a 403 Forbiden Nginx inserted in all Word and Excel files.

I still haven’t found the cause of this error yet. Do not know if anyone in the NextCloud community has encountered a similar situation to me?

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