Currently, Linnworks doesn't support image hosting for Magento2 via extended properties as it does for Magento1.
It would be a very useful feature as this had stopped us from the migration from M1 to M2.
a Feature we badly need
Yes and i think it should be done for other channels too such as shopify and other listing tools that linnworks currently supports
Thank you for bringing this topic up!
This is definitely something that would indeed be useful to have for all channels that we support listing to. I will take this up with our developers to see if this could be planned and added to the development queue.