redim preserve multidimensional array

I have two arrays........if an element is in both then dont transfer it to the "unique" array however, if it is in one and not the other then transfer it to the unique array. But for some reason the unique array is not increasing in size..........

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i found error.......when calculating ubound.......i used "Ubound(unique_file_array)" but it should have been "Ubound(unique_file_array,2)" to account for 2nd dimension.

see code below

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