Alternate Method to copy files to and from Android App (from PC)
I had some photos & videos I had saved to the Android App that I wanted to save to my PC (to edit in Studio 2020) after I had already formatted the MicroSD card in the One X camera.
Here's how to do it if you have a similar need. Connect your phone to your PC ( I use WiFi File Explorer for Android to do it wirelessly). From your PC, Browse to this folder on the phone
storage/emulated/0/Insta360OneX/galleryOriginal/
In this folder you will find 3 sub folders bulletTime, photo and video. These folders will contain the .insp and .insv files saved from your camea to your phone. You can copy files to and from the phone directly from your PC.