Email notifications not consistently including attachments

I have a workflow requesting an update when an invoice is approved for payment. The update includes uploading the invoice as an attachment. The notification workflow sends an email to the Finance team and includes the attachment.

Over the past 6 months, there have been a handful of notifications (out of hundreds) sent that did not include the attachment. Recently, nearly all notifications are being sent without the attachment.

Nothing has changed in the workflows. I am submitting the updates and uploading the attachments like I've always done. It doesn't seem to matter if I drag & drop the attachment or navigate to the file to upload within the update request.

I can't recreate the issue and it's hit or miss if the attachment is sent when I follow the exact same update steps. Is anyone else having this issue? Any suggestions what else to check? Thanks in advance!

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