The app recognizes the drive, shows the capacity but will not allow me to mount it. I tried the app's inbuilt problem solving tool and that showed that everything is fine with the drive.
I need to take this with me traveling in a week or so and formatting to FAT32 is very much a last resort - the drive has 900gb's on it!
Any suggestions? I've emailed the dev's and gone through the app's "report an issue" also.