AI to determine currency

I forward a receipt from my email that is in US funds. So I change from Canadian currency to US currency, but then everything I forward on that is actual in Canadian currency shows up as US currency on the invoices. It says Canadian or US funds but the system doesn’t recognize it, it would be great if the system would recognize the currency and input it. right now, I have to go through each expense to determine if it was Canadian or US funds.