MBXUploadServiceFactory
@interface MBXUploadServiceFactory : NSObject
                Upload service factory.
This class is used to get a pointer/reference to the Upload service platform implementation.
 In order to set a custom implementation, the client must call setUserDefined() method once before any actual Upload service is required.
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Replaces the implementation of the Upload service with a custom one. If you define your own HTTP Service we strongly suggest implementing this interface too.
If a default implementation has been created or a user defined implementation has been set already, it will be replaced. The factory maintains a strong reference to the provided implementation which can be released with the reset() method.
Declaration
Objective-C
+ (void)setUserDefinedForCustom:(nonnull id<MBXUploadServiceInterface>)custom; 
        MBXUploadServiceFactory Class Reference