IBASE Technology SA-101-N User Manual page 7

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If you want to update/add media files in function, you need a USB dish or TF
card, copy the videos and pictures into USB dish/TF card under folder "media",
then plug-in USB / insert TF card to SA-101-N Mini Android Digital Signage Player
series. The device will detect new media files and update automatically after
power up.
After power up，system will automatically copy media files from USB or TF
card. Don't power off device until file copy complete.
For large media files it may take a relatively longer time. After file transfer
completed, it starts playback file in the list.