Using filemask with keepuptodate

Hello all,
I'm working on a script to keep the Documents directory on my server synchronized with the Documents directory on my computer. My goal is to have a script that launches when Windows starts up and runs the keepuptodate command. I want to exclude certain directories inside of Documents from the upload, so I used the filemask command. Here is the script I wrote:

However, running this script returns:

The filename, directory name, or volume label syntax is incorrect.

At first I thought I had some sort of syntax error, but I found that I can run each command individually in the command prompt of WinSCP and it functions (e.g. I run "open sftp..." etc. and then "keepuptodate...")
So, does anyone have any ideas what might be causing this problem and how to prevent it?
I'm using WinSCP Version 5.11.3 with Microsoft Windows 10.
Thanks!

Update:
I realized I had a syntactical error in my initial command, and changed it to:
"keepuptodate -filemask=|My Music\; My Pictures\; My Videos\; Rainmeter\ C:\Users\rwalk\Documents /home/robert/Network_Files/Documents"

However, when I run the updated script I get the error:

Too many parameters for command 'keepuptodate'.
At this point I'm pretty sure I'm just missing some sort of a closer on the -filemask statement, but I'm not sure what.

See https://winscp.net/eng/docs/commandline#syntax