Hi!
I'm trying to implement email attachment upload via an app by following instructions from https://developer.mypurecloud.com/forum/t/uploading-attachments-onto-an-email/2953 and https://developer.mypurecloud.com/api/rest/v2/conversations/upload-email-attachments.html.
First of all both places mention different upload addresses: https://api.mypurecloud.com/uploads/postino-attachments and https://apps.mypurecloud.com/uploads/postino-attachments.
If using api address I'm getting in browser log error: Access to XMLHttpRequest at 'https://api.mypurecloud.de/uploads/postino-attachments' from origin 'https://abc.app' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.
In case of apps address error is : Access to XMLHttpRequest at 'https://apps.mypurecloud.de/uploads/postino-attachments' from origin 'https://abc.app' has been blocked by CORS policy: Request header field authtoken is not allowed by Access-Control-Allow-Headers in preflight response.
Which address should we use and how to troubleshoot that error message?