You'll have to select them regardless of the resolution and file size. Then in camera you can have different jpeg resolutions, or you can convert jpegs on your device, or with whatever app does the transfer. Even CameraConnect allows different jpeg sizes on import.It takes time to select and downscale images - time you may not have.
If you need a reduced size, shoot reduced size jpegs, or reduced jpeg+raw.With a 24 MP camera you can automatically transfer or FTP images as they are being shot from multiple cameras.
Again slow file transfer in complex environments is not the reason Canon goes 24Mp.
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