.txt file has 0 lines (skUtilities)

[QmanRocks]

I'm setting up a server, and one of the commands is for custom join/leave messages. It's a Bungeecord server, so I make it a .txt file when they input it. That way, all the servers can access it for when the player leaves/joins. However, when I have it make the .txt file, it says that the file only has 0 lines, and it doesn't save what the player says on line 1. Here's the code I have right now, which doesn't work. Any help would be greatly appreciated.

command /joinmsg <text>:
    permission: skript.joinmsg
    usage: /joinmsg <custom message to be displayed when you join>
    trigger:
        if directory "../JoinMessages" doesn't exist:
            create directory "../JoinMessages"
        if file "../JoinMessages/%{playername}%.txt" doesn't exist:
            create file "../JoinMessages/%{playername}%.txt"
        set line 1 in file "../JoinMessages/%{playername}%.txt" to "%{playername}%> %arg 1%"
        set file "../JoinMessages/%{playername}%.txt"'s line 1 to "%{playername}%> %arg 1%"
        message "Set &o%arg 1% &ras your custom join message."
        
command /leavemsg <text>:
    permission: skript.leavemsg
    usage: /leavemsg <custom message to be displayed when you leave>
    trigger:
        if directory "../LeaveMessages" doesn't exist:
            create directory "../LeaveMessages"
        if file "../LeaveMessages/%{playername}%.txt" doesn't exist:
            create file "../LeaveMessages/%{playername}%.txt"
        set line 1 in file "../LeaveMessages/%{playername}%.txt" to "%{playername}%> %arg 1%"
        message "Set &o%arg 1% &ras your custom leave message."