Grabbing Images from a Landing Page

Hello!

We have untidily dumped images onto a landing page so that we can use the "grab from web" function in the Design Studio under Images/Files. The Landing page is approved and accessible, however when we try to grab the images we encounter the error below. We are trying to migrate the images from one Marketo instance into another and were told this is the fastest means of doing so (versus exporting and importing).

Any insight into the error is greatly appreciated - I'm wondering if it might be that we dumped too many images onto the landing page?

Note - I have cleared out the folder name and URL from the image below for the post.