How to show both old and new data that is updated via a Workflow PDF template

[kheise]

I know I’ve seen info on this at some point in the community or in Office Hours, but I can’t seem to find it again…

I have a Workflow that generates a PDF template and then emails it it to key departments when certain information is updated. It’s easy enough to get the updated data on the template by simply putting the column name on there but I would also like to show the old data that was updated in the template so people can see the old vs. the new info. What expression would I use in the template to show what the data was before it was updated?

Simple example:
Customer phone number, [Phone], is updated. I need the PDF to show both the old phone number and the new phone number when that data is changed.

Any help is greatly appreciated. Thanks!