Use full-size SD cards. Format the card in the camera after backing up photos. Choose UHS-I U3 for 4K video; slower cards may not support that recording mode.
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Yes, this camera supports USB charging.
Use SAE0012A with the model-specific USB cable and the battery installed.
Get the photos onto your phone.
Turn the camera off, remove its memory card and use the matching reader above. Choose the reader connector for your device: USB-C, Lightning or USB-A. Use Photos or Files to import. Copy your photos before deleting or formatting the card.