ASUS RT-AC87U Router - USB Server Problemer

hey folkens. har rodet med det her i flere dage nu. og har postet mit problem på nogle engelske sider. nu vil jeg også prøve her. copy paster det samme som er på de engelske sider. orker ikke og skrive det hele på dansk nu.

hello. i have a lot of issues with the file server options.
And the USB 3.0 port does not work with my USB 3.0 harddisk.
i am able to connect it to the USB 2.0 port

i would like to integrate my harddisk that is connected to my routers USB port to windows pc, i dont want  to be forced to use the AiCloud website.
and ofc i want to  connect to it from different networks.

i want it to be like this
My PC--Home  Network--Harddisk
My PC--Friend Network--Harddisk
and i want it to act like a harddisk that is connected through USB (integrate it in windows)

-1. first i try with FTP. the issue here is that i can integrate the folder
ftp://my-cloud-disk.asuscomm.com/
bout i cannot integrate this
ftp://my-cloud-disk.asuscomm.com/1TB_-_USB_3.0/ 
and this is a problem for me. i want my harddisk to act  like it is connected directly to the PC from the USB  port of the PC.
so i cannot use the FTP server for my needs

-2. second i try with Samba and this works very good bout
i cannot connect to it from other networks (if i am at a friends house).

-3. and i tried to integrate it via the Aicloud link. i get this error
"joint verification failed. The server's password has expired on the Domain Controller"

i have tried a lot of other things and i just cannot get it to work the way i like it to work.
is it even possible to do what i want to do with this router ?.
I just bought it a couple of days ago for 234 dollars. one of the reasons i got this router was the USB harddisk server options.
And i simply cannot do what i bought it for.