Garageband IOS ipad to ipad project share- receiver can not open
I have saved my GB project in .band format to my icloud drive
Have sent .band file through email to my friend who is running the same IOS & GB version
when he tries to open file GB pops up the error as the file cannot be opened- can be damaged
Same error occurs when he sends his project to me, also tried to open those files on mu IPHONE 7, having same error.
what is the proper way of sharing GB project files between IOS devices?