Share preview link
How to send a link to our support team to view your draft theme
When working with an unpublished theme (also known as a draft), you can send out a preview link, allowing anyone with the link to preview your work/store.
Three steps to generate
Start with your draft theme in the Theme Customizer. Click on the ellipses icon (three dots) at the top next to the theme name and choose Preview:

Next, at the bottom of the page, use the green Share preview button:

Click the "Copy link" button in the popup box:

Shared preview links expire after a certain number of days and are randomly generated by Shopify.