Networked hard drive shared via OS X File Sharing mounted as read-only, but need write permissions as well

Hi!

I have an external hard drive that I am attempting to use as networked storage by sharing it using OS X File sharing on one Mac (I'll call this Mac 1, running Mojave 10.14.5), and then mounting the hard drive over the network to another Mac (I'll call this Mac 2, running Mojave 10.14). I want to have write access to this hard drive over the network, but can only manage to get read-only access. When I run `ls -l` on Mac 2, it appears that I should have write access:

JunsMacbookAir:~ junyu$ ls -l /Volumes/WB3TB/
total 160
drwxr-xr-x  1 junyu  staff  16384 Jun 14  2018 Music
drwxr-xr-x  1 junyu  staff  16384 May 24  2018 Photos
drwxr-xr-x  1 junyu  staff  16384 Jul 24  2016 Videos
drwxr-xr-x@ 1 junyu  staff  16384 Jun 15  2018 x_Other
drwxr-xr-x  1 junyu  staff  16384 Aug 11 21:35 x_TODO_IMGFROMPHONE

Here's what I get when I try to create a file on the hard drive via the terminal on Mac 2:

JunsMacbookAir:~ junyu$ touch /Volumes/WB3TB/test.txt
touch: /Volumes/WB3TB/test.txt: Read-only file system

Here's the file system format of the external hard drive in question (viewed from Mac 1):

Here's the output from the `mount` command (relevant hard drive is at the end)

JunsMacbookAir:~ junyu$ mount
/dev/disk1s1 on / (apfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk1s4 on /private/var/vm (apfs, local, noexec, journaled, noatime, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
//test@Zhen%E2%80%99s%20MacBook%20Pro._smb._tcp.local/WB3TB on /Volumes/WB3TB (smbfs, nodev, nosuid, read-only, mounted by junyu)

Any advice on how to get write access for the networked drive would be appreciated.