Local external storage not working on nextcloud installed in raspberry pi

I have just installed nextcloudpi on my raspberry pi using the guide from this youtube video. Things works out fine until I reach the end of the video guide where I need to mount my external harddrive in ext4 format to the nextcloud.

Upon calling blkid I get the following output from my raspberry pi, and I can see that my usb drive is in sda1.
root@raspberrypi:/mnt# blkid
/dev/mmcblk0p1: LABEL_FATBOOT=“boot” LABEL=“boot” UUID=“EBBA-157F” TYPE=“vfat” PARTUUID=“2fd0ff64-01”
/dev/mmcblk0p2: LABEL=“rootfs” UUID=“b3ce35cd-ade9-4755-a4bb-1571e37fc1b9” TYPE=“ext4” PARTUUID=“2fd0ff64-02”
/dev/sda1: LABEL=“hdstorage” UUID=“bbe052c6-c6d9-425a-b46d-9d931302f3c6” TYPE=“ext4” PARTUUID=“75daa63d-2771-4289-ba29-e10fdd6f9743”
/dev/mmcblk0: PTUUID=“2fd0ff64” PTTYPE=“dos”

I then mounted it into the mnt and made it writeable using chmod 777

root@raspberrypi:/mnt# ls -l
total 40
drwxr-xr-x 3 root root   4096 Dec 20 16:12 appdata
-rw------- 1 root root   6144 Dec 12 08:17 aquota.group
-rw------- 1 root root   7168 Dec 12 08:17 aquota.user
drwxrwsrwx 5 root users  4096 Dec 22 21:59 hdstorage
drwx------ 2 root root  16384 Dec 11 14:02 lost+found

Then in the web interface under External storage, I configured as shown below

Going into Files I can see the local folder.

However when clicking into the local folder it is empty, and I can’t see the existing test folders and test files I have created inside hdstorage. Nor can I create any folders. I am uncertain what I am doing wrong and

  1. Why can’t I see the existing folders and files in my usb hard drive?
  2. Why can’t I create additional folders inside the local folder?

I read from this doc that the default mount point should be in /media/USBdrive. I therefore remounted my usb harddisk to this mount point and also changed external storage configuration to this mount point. Still I cannot access the files in my usb harddisk or create folders there. Also it looks like that the doc is outdated, since things like nc-automount does not exists any longer in nextcloudpi

I also noted that if I now go into the External Storage under my personal tab, I get a red icon.

. What does this mean?