When Importing to Adobe Rush it only shows 1 second of the full video

[Anthony Cif]

When I import my 20-minute long file into Adobe Rush for some reason it only shows up as a 1-second video in both the media browser and the editing timeline. I have tried uploading it to my computer and to Adobe in many different ways but none of them seem to work. Has anyone encountered this before and how have you fixed it?

[Ko.Maruyama]

What type of file is the original 20 minute source?

Is it compressed / segmented?

[Anthony Cif]

It is a MOV file, 1080P 60FPS. I do not believe the file was compressed or segmented but I am not a 100% sure, what would be the best way to find out?