Non-US company on US exchange

Hello,
The documentation mentions that only US stocks may be purchased, but it doesn’t specify whether that’s a US-headquartered company or just a stock listed on a US exchange. For example, could I purchase APHA through Alpaca? It’s a Canadian company listed on NASDAQ.
Thank you.

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I think you can try it on paper-trade first to know whether it can be purchased or not. Or is there any update about this matter?