The lats attach to the upper arm, near the shoulders. They actually make up the “back” of your armpit, if you raise your arm, the pecs in your chest create the front “hill” and the lats / other muscles the “back” hill, with the pit inbetween.
So yeah, they attach to the upper arm and exist to move your arms downward.
You can google “Latissimus Dorsi” and you will find pictures showing the location
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