Can't connect by SMB to Raspberry

Hello, I am new into this so I followed this tutorial: where I configure a Raspberry Pi 4 with an external storage to be my private cloud storage. And I followed everything correctly and without errors just until the end, where I tried to connect to my Raspberry through File Explorer with “\” (as it happens in the video in minute 8:39) but Windows tells me that it cant be found.

Apparently everything is ok, as shown in the photo but I cant connect.

What can the problem be?

sorry, this is not ownCloud related. Closing.