Quicktime Player needs to be open

Sometimes there is an issue which means Quicktime Player needs to be open to find the device. Unsure why this is.

Workaround

• Open Quicktime
• File new movie recording
• Open DeviceMonitor
• App works

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Same issue reported by another developer - https://forums.developer.apple.com/thread/91266

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Also https://stackoverflow.com/questions/48166748/coremediaio-doesnt-list-iphone-camera-unless-quicktime-is-open