Exciting bug fixed for Caldera Forms! In some cases advanced file fields, with multiple files, that were note set to be added to media library, were not attached to email. This was introduced in 1.4.5 and is now fixed. I appologize for for this fairly major bug, it worked in all other situations — one file attached or when files were added to media library. For more information on how file attachments work, please see this page in our documentation.
If this situation describes your form, please update now via WordPress. If not, you can stay on 1.4.6 for now.