Can't post to forum with attachment - error 403

Question

Hi, have been trying to post a bug report on KuTools Outlook forum , but it always fails to post with a 403 error.  I have tested a post without attachment (works), tested with attachment (fails).  Attachment is word docx format of 256kb. Can you please fix the posting error on this forum so I can post my actual problem with the attachment showing the error messages I am getting when trying to de-duplicate emails.  Thanks, Phil