Play mp3 files from iCloud on iOS

Hi to everyone,
I’m trying to create a iOS app to play mp3 downloading them from the iCloud account.
Now I’m trying to access iCloud to list a directory up there but I cannot because for instance CloudKit is not visible in the list of component in Xcode (maybe I need to have a payed developer account to enable it?). Is there another way to point to a remote file… how is the code to be implemented for that? Maybe is better to use Google Drive?
Thank you in advance for your help,