Samsung SMART TV E-Manual page 156

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Supported file systems are FAT, exFAT, and NTFS.
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Sorting the files in Folder view mode can display up to 1,000 files per folder. If the USB device
contains more than 8,000 files and folders, however, some files and folders might not be
accessible.
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PTP connection mode is fully available only with digital cameras. When connecting a smartphone
or tablet to the TV using PTP mode, it may not be recognised.