merge PDF submacro gets stuck iin the while loop unless full path of varibale defined

Ok so below is a code that takes pdfs from one location based on a visible cell range and then put them in a created directory and then calls another module to merge the pdfs. In the second module there is a variable strPath that when the full folder path is defined it works fine. However trying to use a structure like "..\Submittal Packaged\BOM PDF\" it gets stuck in a while loop. I have debugged and watched it step through and find every pdf file in the folder but instead of not seeing the end it loops back to the beginning.

The below code is configured in the way I am having issues.

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the loop is not on files, its on the cells...
For Each rng In Range("L9:L1042").

Please scroll down further in code the loop it gets stuck in starts like this.

' Start the loop.
Do While strFileName <> ""

The Sub Copyfile2() is not the issue its the Sub mergepdf()