So i got a sony xperia Z5P with android 6.0.1 Marshmallow with me. About last month, i bought 64GB USB drive OTG. I know i have to detect usb device to be able to use the usb. So after my phone detect the usb drive, i use file comander and solid explorer to check it. It's showing that my usb drive only have 1.3 gb on file comander and "space usage not available" on solid explorer but when i try to move a 3 gb file from internal, i can just move it without any problem. So then i move few photos normally. Then i got curious, i plug the usb drive on my sony xperia C and it's showing perfectly that my usb drive had 64 gb capacity and i can even open photos inside my usb drive on gallery with my xperia C phone, which i can only check my files from explorers app on my xperia Z5P. So the question is, was it suppose to be like that? If not, can i fix it? How? Thank you for your answers.