4TB USB HD + Apps2USB only 1.64TB detected

Hi
Im using a PS4 Pro on 5.05
last night I ran APPTOUSB 5.0x V2 by Stooged
I left my PS4 transferring over night and it was powered off in the morning.
The USB drive is a 4TB Hard drive (exfat) (plugged in at the back)
Under settings there is only system storage displayed and only 1.68TB is detected. It's a 4TB drive.
Is there a fix?

Thanks