iPads and other mobile devices may have recorded your footage using a variable frame rate. This will become apparent once you are working with your footage in Premiere Pro -- the audio and video will not be synchronized properly. To fix this, we'll use Handbrake.
Open Handbrake, and select the file you recorded on your mobile device.
Choose your ONYEN folder on Media Storage as your destination, then select Constant Frame Rate.
Start Handbrake with the green button at the top and allow it a few moments to convert your footage from a Variable Frame Rate (VFR) to a Constant Frame Rate. Once you have the new version, head to the Media Browser window in Premiere Pro and select the Constant Frame Rate version to edit in your project.