Since I don’t know your level of expertise, I’ll go step by step. Forgive me if you already know how to do some of this.
In terminal, type “sudo nano /etc/fstab” (without quotes). This brings up a file where you can add the mount point so it mounts at boot and set options for the mount. Go to the end of the file and enter a line like the following, substituting your info in the appropriate places:
//[static ip for nas]/[top level folder on nas you want to mount] /[mount point in Linux] [file system type for mount] [mount options, nas login credentials, permissions] 0 0
Mine looks like this: //192.168.1.0/Media /mnt/Media cifs _netdev,user=anonymouse,password=*****,uid=1000,file_mode=0777,dir_mode=0777 0 0
The “_netdev” option is the one that delays the mount until after your network is up. The “file_mode” & “dir_mode” set the mount permissions. There is info out there showing how to insert a reference to a credentials file instead of placing them in fstab in plain text, but I didn’t bother since I have my computer and user profile pretty well locked down.
To get _netdev to work, I had to enter the following in terminal (without quotes): “sudo systemctl enable systemd-networkd-wait-online”.
I couldn’t find all the sites I visited while setting this up, but here are a few: