Plyer camera cannot save image to the IOS phone

[Junhano]

Error
2020-05-08 21:02:13.732079-0700 chiroview[25063:7296873] Image saved successfully
2020-05-08 21:02:24.039660-0700 chiroview[25063:7296873] [chiroview] IIOImageWriteSession:121: cannot create: '/private/var/containers/Bundle/Application/AC8438C9-24DC-42EF-886B-897FAE254901/chiroview.app/YourApp/test.png.sb-adbcd51c-fbT6Fo'
error = 1 (Operation not permitted)
2020-05-08 21:02:24.039745-0700 chiroview[25063:7296873] Error -> failed to create image destination.

My code

def capture(self):                                                                    
    try:                                                                              
        file_name = "test.png"                                                        
        camera.take_picture(filename = file_name,on_complete = self.camera_callback)  
                                                                                      
    except NotImplementedError:                                                       
        pass                                                                          
                                                                                      
def camera_callback(self, filename):                                                  
    if (exists(filename)):                                                            
        print('Hello')                                                                
    else:                                                                             
        pass       

I don't know what's wrong with my plyer camera. I can successfully start the camera, but when I click cancel, my console says image saved successfully. But when I actually took the picture and try to save it to my phone, it says operation not permitted error. I did some research and find some similar post, but I didn't find a good solution to my problem. The on_complete call back function never gets called. Anyone who knows what's going on can tell me what's wrong with my Plyer Camera?

[Python3-8]

There's nothing wrong with Plyer. It's just that your app doesn't have permission to save files to the iOS device. If you were using Android, then I would have recommended requesting the WRITE_EXTERNAL_STORAGE permission. But I don't know anything about iOS permissions.

[tshirtman]

on ios, you need to write to a directory where you have permissions to write, you can use the Documents/ directory for that.