With Copy Task can I use Variables in the include file mask file filter screen.

I want to use {TASK(ddf470a7-75d0-47ae-a82a-3548e887dc83,Result.UploadedFilesNames)} but when I have multiple files it errors with
Exception in Task: Illegal characters in path.
Exception in Task: No file(s) copied

Yes, it is formatted with a line break while the Task requires a semicolon as separator.

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Can you please supply me with an example.

There is no sample for this. Perhaps a workaround is to use substitute Variable on that Variable to replace enter with semicolon.

{STRING(Replace,{TASK(ddf470a7-75d0-47ae-a82a-3548e887dc83,Result.UploadedFilesNames)},\n,;)}

Not sure if this will work but you can try.

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