Currently Linnworks doesn't support adding Video to Product pages in Magento 2

Images on magento 2 are enabled in the same section as Images so it wouyld maybe jsut be a case of allowing video formats within the images tab of Linnworks and magento should then recognise this.

I understand Linnworks are working on adding Video support for eBay so see if you cna do the same for Magento 2 at the same time