Add a link column to your item or sub-item. Name this column ‘Proof link’ for example.

From your monday.com board, click integrate.
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In the Automation Centre, search for “PageProof” and choose either item or sub-item ‘keep in sync’ template.

Note
If you already have the template added to your board, skip steps 1 & 2 in this section.

Open the template and click item.

Find the link column you’ve just created and click the blue plus '+' icon to map a PageProof field.

Select Proof URL from the drop-down option.

Click update automation.

Now you can click the link in the new column you made when using the desktop app to open the proof.