I tracked down the issue to another plugin. Apparently if you use an SMTP plugin to handle outgoing emails for your WordPress site, it breaks the attachments for emails sent from AIO Forms. I’ve tried with two different SMTP plugins and they both do the same thing. When disabling SMTP and using the built in mail() php feature for sending emails, they work as they’re supposed to. Unfortunately mail() can be unreliable.
Post SMTP and Easy WP SMTP were the plugins I tried.
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This reply was modified 2 months, 4 weeks ago by rmp84.