The file size limit depends on which QuickBlox Cloud plan you are subscribed to:
Basic - 10 MB
Starter - 25 MB
Growth - 50 MB
HIPAA - 50 MB
Enterprise plan customers can set up a custom file size and also limit the maximum file size for upload/download using third-party libraries on top of our SDKs / API in their applications.
Find more information about QuickBlox Plans here: Pricing | QuickBlox
Feel free to check our official documentation for more information that will help you to integrate QuickBlox services into your applications / projects or contact our Support team by submitting a ticket if you have any other questions.