title: Oracle Apex link to BLOB from different table
body: <p>I've got a form in which I want to display either a download link for a BLOB or use a file browser field to do the same.</p>
  
  <p>I can manage the file browser method normally, however because the BLOB I want to refer to isn't part of the table the form is based on, I can't seem to get it to show properly.
  The best I've got so far is a 'display only' field with an SQL query returning the size of the file.</p>