I seem to understand most of this but the custom field is not getting updated.
After reading the numerous post, I am still no closer to resolution. 
I have a SAEF form with a link and a text field.
<br />
<input type="text" name="field_id_66" />
Click the link above and a popup opens with this form.
{exp:file_upload:upload_form form_name="entryform" destination="Video Upload Directory" field_name="video" return="_incl/file_upload_placement" rename_duplicates="yes"}
<p><input type="file" name="userfile" /></p>
<p><input type="submit" value="Upload" /></p>
{/exp:file_upload:upload_form}
This popup form gets submitted to the same popup window where I have this:
{embed=_incl/doctype}
<html>
<head>
{javascript}
</head>
<body>
{exp:file_upload:upload_confirm field_replace="replace"}
<p>Video successfully uploaded!</p>
<input type="submit" value="Place Video and Close Window" onclick='fileplacer();window.close();' />
{/exp:file_upload:upload_confirm}
</body>
</html>
This routine is definitely uploading the file to the correct directory, but no updating of the custom field I named “video”.
The “Place Image and Close Window\” simply returns the homepage in the popup.
Now I realize this is covered in more than 1 post but nothing I’ve tried has worked.
