The introduction of YouTube’s requirements on the panoramic audio and video format standards.
https: //support.google.com/youtube/answer/6395969?co=GENIE.Platform%3DDesktop&hl=en
The panoramic sound files shot by Insta360 Pro directly support this requirement.
Open Premiere CC 2018, create a new sequence, and select the preset with the Ambisonics option under VR, as explained
in NOTE on the right:
For editing monoscopic equirectangular VR files at 3840h x 1920v 2: 1 video at 29.97 frames per second 48 kHz (16 bits)
four channel Ambisonics audio.
Note: Within Premiere Pro’s Audio Preferences, ensure that the “Multichannel Mono Media” default audio track option is
set to “Adaptive”.
This will assure Ambisonics audio media is properly managed as an adaptive multichannel media.
Set Multichannel Mono Media as Adaptive in Audio preferences.