In the patch file included here I neglected to add one required line
which is required in order to create a temporary column in the attachment
table during the upgrade process.
In impex/systems/phpBB2/001.php, around line 89, and AFTER you
use the patch file, find this:
Code:
'13' => array('post' => 'importpostid')
Replace with:
Code:
'13' => array('post' => 'importpostid'),
'14' => array('attachment' => 'importattachmentid')
If you're in the middle of the process, just add a BIGINT colum
named 'importattachmentid' to the attachment table.