I'm sure this is easy but I can't seem to get it to work.

I have a FTP task that I'm using to send files to a server. I want to send 3 specific files from a directory containing many more files.

So the directory might have:
file1.txt
file2.txt
file3.txt
file4.txt

I want to send file1.txt and file2.txt only. What should my Include File Mask look like?

file1.txt;file2.txt

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