Browse for file with flash

Is anybody able to figure out what’s wrong with this (or specifically
why it doesn’t work in mac browsers)?

I’ve tried lots of different options including the yamago component
( The yamago component works but I
don’t like the complexity of the code, it’s difficult to edit. It also
doesn’t work in safari on a MAC.

My example above is the simplest version I’ve been able to get working
but unfortunately only on PC.

Any ideas?