Lightroom CC (iPad): Enable saving and working from external hard drive

I mainly work on my iPad when I‘m on the road and often have no internet connection. Therefore, I‘d really like to have the opportunity to save my pictures on an external drive and being able to work on them in LR.
I can get the point of moving to a cloud-based solution (at least from a business standpoint), but in most cases when you're on a trip and got a ton of pictures to store and work on, the whole cloud-based workflow is simple not working. Not to mention the more-than-boring workflow to get them into LR classic for archiving purposes.