Invoices no longer attached to order emails

[TorlockC]

We use a plugin from WP Overnight to attach PDF invoices to WooCommerce order emails. WP Offload SES has worked fine with this setup until recently when I updated and now the PDFs are no longer attached to the email. The email still gets sent by SES, just without the attachment. Changing the “Send Mail Using SES” option to off and retrying will fix the issue but obviously we’d prefer to send everything through SES as we did before.

Worth noting that the PDFs are only about 210 KB so figured it’s not the 40MB limit. Also, can’t see anything in the error log related to this.

WP Offload SES Lite Version 1.6.3
WooCommerce PDF Invoices & Packing Slips Professional Version 2.9.2
PDF Invoices & Packing Slips for WooCommerce – Premium Templates Version 2.20.1
PDF Invoices & Packing Slips for WooCommerce Version 3.5.2

Any help would be greatly appreciated.