A while ago I modified and added custom-message to every product in the store, I noticed that custom-message appears inside the order, but it does not appear on the Print packing slip page.
How can I make a custom-message appear within the Print packing slip page ?
Please go through this link
you need to edit the template and pass the variable in the template.
I did not find the variable for custom-message in the list
Can you please send me the screenshot of the message which you want to display.
HelloIn the first picture, it shows where the customer enters his notes
In the second image, it is shown that it appears in the orders control panel
In the third image, custom-message does not appear in Print packing slip