Error: Authentication Required - when uploading attachments to Creatives

You may receive Error: Authentication Required when uploading attachments to Creatives.  This occurred on Macintosh computers when using Chrome.  The error will repeatedly occur and not allow you to upload the file successfully. 
Increase the “FileUploadChunkSize” web.config setting.  In this case it was updated to 20,000.

Environment

 Blackbaud CRM
 4.0

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