i'm running this request (curl version, but the same is happening in a java application)
I'm following this guide:
curl https://{domain}.zendesk.com/api/v2/help_center/articles/35853340916247/attachments.json \
-F "inline=false" -F "guide_media_id=01K8TCJMYFDE3EY9VPQKWE00E1" \
-v -u {email/token} -X POSTthe article id and guide_media_id are actual ids, i redacted my auth string and my domain name. If this is a specific issue, i hope you can contact me, otherwise please advise how i can get support.