Panasonic LUMIX DC-GH6 Owner's Manual page 514

Playing Back and Editing of Images – [Playback] Menu
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If the copy source is a PRIVATE folder, only [Create a New Folder] can be
selected.
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You can set up to 100 images at once with [Select Copy].
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The [Protect] setting is not copied.
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Copying may take a while.
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When using the following combinations of cards, video copying is not available:
– Copying from CFexpress cards to SD/SDHC memory cards
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