title: PDF file damaged after upload but local copy is fine. How could this be happening?
body: <p>I have a pdf file which I am uploading to my server. I can open the local version through my browser and it opens fine, but when I upload it to the server and try to open it directly through there then I get a:</p>
  
  <blockquote>
    <p>The file is damaged and could not be repaired message.</p>
  </blockquote>
  
  <p>Likewise, if I download one of the many pdf's on my server to my local computer, then there is always now some error in opening them or they are blank. </p>
  
  <p>I am using FileZilla to upload and download the files by ftp.</p>
  
  <p>This situation has only just started and I'm not sure why. I have a backup directory of the pdf's and have copied and replaced all the files with the backups in an effort to fix the issue. I am now able to type the file location into the address bar and view them like that which is an improvement, but if I try and download them, then I get some sort of error which means I can't view them.</p>
  
  <p>Any ideas why this could be happening?</p>
  
  <p>Many thanks</p>