Tucked into an otherwise innocuous update, Instagram added an arguably more significant feature to its fresh video capabilities for both iOS and Android.
In its update FAQ, Instagram explains that now videos will be preloaded for autoplay, something loathed by some users—especially if that autoplay will include ads that use their 3G and 4G bandwidth. Instagram even acknowledges that while preloading makes videos start more quickly, it also uses more data.
So the part about data usage controls means that you can get auto preloading to stop at least some of the time by choosing to have videos preload only when you're connected to Wi-Fi, thus sparing your data plan.
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