With the new UI in Lightroom Mobile for iPad, the option to export a collection to Adobe Clip has missed. Doing this from the Adobe Clip application isn't feasible because you have to Select the photos one by one.
Since this export feature is now missing from Lightroom mobile you now have to needlessly waste time creating slideshows. The workaround requires selecting images in the sequence manually in Premiere Clip. For slideshows, the sensible workflow is to sequence your images in Lr Mobile. That sequence should be preserved in Clip. There should at least be an option in clip to select ALL photos and more specifically in the order they appear in Lr mobile. Please restore this functionality.