After formatting USB disk to ext4, I can no longer change permission to folders

[medwatt]

I formatted my USB disk to ext4 partition so that I can install Entware on it. Prior to that, I had a couple of folders shared via Samba with two account; admin with R/W and a guest account with on R access. After setting up Entware, it seems I can no longer gain to the folders on the USB disk unless I sign-in with the admin account. I cannot even see those radio buttons on Asus web interface that let's you select the permissions different users are allowed. Any idea why this is happening ?
drwxrwxrwx 2 admin root 4096 Jun 21 04:40 APK

 

[ColinTaylor]

After you formatted your USB disk you will need to recreate the users and share permissions from scratch as they wouldn't have survived that process.