Panasonic Lumix DC-S1 Owner's Manual page 437

If [USB Mode] is set to [PC(Storage)] in the [Setup] ([IN/OUT]) menu, the
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camera will be automatically connected to the recorder without the [USB
Mode] selection screen being displayed. (l 355)
Do not use any other USB connection cables except the supplied USB
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connection cables (C–C and A–C).
Take care not to turn off the camera while storage is in progress.
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Images such as 4K videos may not be supported depending on your recorder.
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Turn off the camera and disconnect the USB connection cable before
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removing the card from the camera. Otherwise, the recorded data may be
damaged.
For the storage and playback procedures, refer to the operating instructions
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for the recorder.
16. Connecting to Other Devices
437