403 Error

I have uploaded a few items files in the form of PDFs, but some PDF files seem to generate the following error although they are under 64 MB.



You don't have permission to access /wos/admin/items/add on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I'm not sure of what would cause a 403 error when uploading a PDF like that.

This sounds like an error coming from Apache, so there may be some server setup on a lower level than Omeka that's rejecting those uploads.