How to modify UltimatePDF to force cover image?

Using my Dolibarr DoliStore's external modules
1

Hi everyone,
Does anyone know where and what needs to be changed in the UltimatePDF module to force the cover image?
My Dolibarr is synchronised with my Presta Shop and I create the products in PrestaShop. Once a product is created in Prestashop it appears in Dolibarr with all the images. The images names look like that XXXX-XXXX.jpeg and all the cover images contain word “cover” coverXXXX-XXXX.jpeg
At the moment to display the product images in the PDF document I need to change the displayed image eg. to 8888.jpeg so the document displays the cover instead of a random picture. It is very time consuming but not so bad if the product has 2-3 images but if the product has more eg. 10 images it takes ages to work out the names for the images so they are displayed properly.

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@pscoffoni can you help with it?

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Has anyone managed to solve this problem?