Space in path or filename on a multi_single selection

[CodyOakes]

I would like to use PDFtk to merge selected pdfs into a single pdf, this menu item currently works so long as there aren't any white spaces in the file names or file paths of the selected files.

item(type='file' mode='multi_single' find='.pdf' title='Merge PDFs' image=\uE202 cmd='cmd' arg='/k pdftk @sel cat output MERGED_PDF.pdf' wait='true')
(I have added the cmd as cmd and the to the args /k just so the output window would stay open after running the cmd)

Given the following path with the following files:

It assumes additional files for each whitespace:

If I replace @sel with "@sel" then all the selected files are treated as a single file selection by PDFtk:

Is there a way to add "" around each selection in the @sel reference? Is there another work around that I'm missing in the docs?
Any help would be greatly appreciated. Thanks!

[RubicBG]

sel(true) - https://nilesoft.org/docs/functions/sel

Add a third parameter to the sel function to change the path separators.
It is possible to assign the quote to the first parameter through these options
0 = Unquote, 1 = Double quote, 2 = Single quote, Or use a string instead.

sel(0, ",", "/")
sel(1, ",", '\')
sel(2, ",", "/")
sel('"', "\n", ">")

(source: https://discord.com/channels/1106387012707168318/1112126326665650176/1150156808829292615)

[CodyOakes]

Sweet! Worked like a charm, not sure how I missed that in the docs. Thank you for your help @RubicBG