It is two or more shoes if "zapatos" is used instead of "zapato". And plural objects need plural possessives.
Then whay does the correction say to pay attention to the gender and not to the plural??
There are a number of occasions when (having gotten it wrong) the correction refers to 'gender' instead of 'plural'. Clearly an error by the authors. Reporting it would help them fix it.
My shoe... 'mi Zapata'...my shoes...'mis zapatos'
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mi would be if you are talking about one shoe. So mi zapato would be correct meaning my shoe. mis would be if you are talking about more than one shoe. So mis zapatos would be correct meaning my shoes. mis(my) is the plural of mi(my), zapatos(shoes) is the plural of zapato(shoe).
"Zapatillas" is specific to high heels and "zapatos" refers to shoes in general
Zapatos is for shoes in general. Zapatillas is for sport footwear (tennis shoes), sneakers or running shoes, or ballet shoes, or even slippers, etc.
That would be "the shoes of I." "My" and "mi" both mean 'the thing that belongs to me'