What are you seeing when you say it’s not syncing properly?
Quick walk-through:
1. Import all of the footage and audio
2a. Select all of the 70D clips in the browser
2b. Open the inspector, and in the Info tab, enter a value in the Camera Angle field (Cam A). I enter Reel names, too (Day01_Card01)
2c. Select all of the GoPro footage in the browser
2d. Enter a different value in the Camera Angle field (Cam B)
2e. Repeat for iPhone footage and sync audio
3. Select all of the elements in the browser, right-click, and select New Multicam Clip…
In the dialog that pops up, I think Use Audio for Synchronization is checked automatically. Once you set your parameters, there will be a bit of processing which will then deposit a new multicam clip in the browser.
Doug Metz
Anode