Symptom
The following error appears in a Microsoft SharePoint Server 2013 subsite:
Error with request to the server: Access denied. You do not have permission to perform this action or access this resource.
This error can occur under the following conditions:
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The subsite has unique permissions not inherited from the parent site collection.
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The Limited-access user permission lockdown mode site collection feature is enabled for the parent site collection where the subsite exists.
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A list is shared on the subsite with a user who has edit permissions enabled.
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The user attempts to add a file to the list by using the drag files here functionality.
Workaround
To work around this issue:
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Select new document.
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Select UPLOAD EXISTING FILE.
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Follow the steps in the Add a document dialog box to add files to the list.
More information
For more information, see the following Microsoft articles: