Can you consider using Mega at least for the android port, it makes it easier on android users because they don't have to worry about the download failing do to discrepancies excluding storage.
I must say this is the first time I've heard that one. Every one I know seems to like mega because it manages the download for you and is free unless you plan to store large amounts of data on mega. You also don't have to interact with the app much at all after setting it up because you can just install the app from the mega folder in your storage.