Size chart image at product page
To create a size chart in a popup that is opened from a custom button will involve multiple modules:
1. Create one or more popup modules in Journal > Modules > Popup with your size chart image.
2. Create a Button module in Journal > Modules > Buttons with the link pointing to this popup module.
3. Create a Journal > Product Extras > Extra Modules and assign it to the relevant products via Product Assignment and Product Rules.
4. In the builder of this module add a row and column and load the Button module which will open the popup.
Learn more about the product assignment and rules here: https://docs.journal-theme.com/docs/workflow/assignment