Use a Smart Device as a Wireless Shutter Release for the Nikon D7200 - dummies
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Connecting via Wi-Fi to Cameras That Support the Wireless Mobile Utility | SnapBridge Help | Nikon
Nikon J5 Review - Field Test
I've seen a few dead posts for Alternatives the Nikon WMU app this is my favorite so far. as far as it being free, feature rich and effective. Cascable. Hope this helps
Connecting via Wi-Fi to Cameras That Support the Wireless Mobile Utility | SnapBridge Help | Nikon