Icloud files and locally synced files

I have my drawings in icloud so I can view it on iphone and ipad, but when I use ipad some time in poor signal condition is a problem to download the file, it takes time, so I ask:
Is there a way to sync most important files locally on ipad and the same way is stored on icloud.
So when the signal is poor we can open a locally copy of the same drawing?