How do you encapsulate a MultiSample and make available the file dialog as a ?greenVar

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I'm trying to encapsulate a MultiSample and make available the file dialog as a ?greenVar. Trial and error and the multiple options isn't getting me close. Not sure if green variable ?pathToSample in file dialog needs to be an element of the array or the array, and if it should be within {} or left as is. I've also not sure if I use "File(s)" as the supplied valu

e, whether or not I need to list a single string, array of files, or include {} here. The multisample is reliant on a few parameters so I don't think it would be good to leave outside the encapsulation. In any event, the use of ?greenVar within a file dialog box is throwing me. Any help or examples are appreciated.