Unfortunately, not without replacing the mainboard. The system was available with the option of a 2.5" hard drive - but the version that has a 32G eMMC doesn't have a connector for a hard drive.
You'll likely find that replacing the board will be 50% or more of the cost of the system initially.
Anything else you add must be external.
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Can you please brief us more on this. Are you looking forward to upgrade anything in specific?
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