Reducing logic pro file sizes on ipad

I have finished song files in iCloud that are well over a gigabyte in size and others that are a couple of megabytes. At first I thought the big ones might have lots of embedded samples, but that doesn't appear to be the case.

Can you shed any light on this? It's possible the files contain hidden unused audio elements. Apparently on the desktop version it's possible to remove these. Can I remove them when using the iPad version.