The first thing to check is which WooCommerce email notification you’re attaching the invoice to. You can verify this under WooCommerce > PDF Invoices > Documents, select the document type, then scroll to Attach to:
![An image of the attach-to settings](https://docs.wpovernight.com/wp-content/uploads/2024/05/attach-to-processing-order.png)
Remember to check that you have the correct document type selected while in the Documents tab:
![](https://docs.wpovernight.com/wp-content/uploads/2024/06/correct-document-selected-via-documents-tab-troubleshooting-attachments-1.png)
Using MailPoet, Sendgrid, or another similar transactional mail service? #
Some of these services either don’t allow attachments, have capped the attachment count to 1 document or have capped the file size limit to 1 MB.
How to track your mail #
In addition to answering the above question, please follow these steps to find out if the issue occurs before the message is sent:
Install and activate the WP Mail Logging plugin.
Go to Dashboard > WP Mail Logging > Settings, and enable the Display Attachments option:
![](https://d33v4339jhl8k0.cloudfront.net/inline/16484/465c5051ab6a4d2d9b548b82cde00b7ecf892e8b/2fad598e123410bb28f04259583f3d483fdf7531/d7f41bd3b623747f3ec98733e4d70d4f.png)
Open an existing order, find the Send order email panel, on the right side, select one of the email notification in which you attach the invoice.
![](https://docs.wpovernight.com/wp-content/uploads/2024/05/send-order-email-troubleshooting-attachments.png)
As an example, you could select Completed order, then click on Save order and send email.
Then go to Tools > WP Mail Log, find your last email & check if there are files in the Attachments column and/or any notice on the Error column.
![](https://d33v4339jhl8k0.cloudfront.net/inline/16484/75cfc9c41c9d4588dc2839b475781cb9ff02a429/97e650ad098bf6eb976a91a7997895266112f0b7/mail-log-list.gif)
Lastly, share the results with us. 🙂