Can this way of defining and using a global variable work?

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I have main.mlx, plot1.m, and plot2.m. plot1.m and plot2.m is called from main.mlx, get data from 'main.mlx, create plots, and save plots. I want to define a folder that these plots will be saved.
I think of using a global variable to define the folder.
I say, at main.mlx
global folder
folder = 'C:';
Then I say, at plot1.m,
filename=fullfile(folder, 'plot1.jpg')
exportgraphics(t,filename)
Will this work?
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