Hello i get an error on uploading any file with any extension. I cannot uploading and cannot get the cause for the error. Please help me as soon as possible.
Sorry to hear you’re facing problems 
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Can you please guide what can be the possible errors ??? I cannot find any file with shows the Forbidden error in nextcloud. can you tell me the file?
Are you sure it is ANY file type? Have you tried uploading a simple text file?
I am having issues uploading particular file types, renaming them with a different extension allows them to be uploaded and then they can be renamed within nextcloud and they work fine.