title: Drupal 7 - can't upload files
body: <p>I'm getting an error when trying to upload any type of file via Content>Files>Add File. The error reads "The file <em>filename</em> could not be saved. An unknown error has occurred. The file in the Upload a new file field was unable to be uploaded."</p>
  
  <p>I've read through many threads and most seem to indicate a permissions problem. I've checked that all directories are configured properly. Public files are set as sites/default/files; private files are set as sites/default/files/private; and temporary is set as sites/default/files/tmp.</p>
  
  <p>Then I found this error in the server logs:</p>
  
  <p>[Tue Mar 27 10:49:26.932464 2018] [proxy_fcgi:error] [pid 20750:tid 140070898026240] [client nn.nnn.nn.nn:63784] AH01071: Got error 'PHP message: PHP Warning:  File upload error - unable to create a temporary file in Unknown on line 0\n', referer: http://<em>ipaddress.com</em>/file/add </p>
  
  <p>Any ideas what might be wrong here?</p>
  
  <p>Thanks,
  CJ</p>