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Awesome. Thankyou.

I'll definitely be using debug mode.

Its an issue with a loop somewhere in my code as no matter how many files I process, the first half of them return correctly and the latter half return null.
i.e. I processed 6 clouds in a folder. got 3 to return correctly and the last 3 returned null. Processed 4 and got 2 correct, and so forth.

I will do further debugging to see what is the issue.

Thanks again for your help!

Thanks again. the issue was that I was looping a QStringList allSelectedFiles but at the end of the loop I was calling:
to get the string being stored for that loop. This was reducing the size of my list as takeAt() physcially removes the element from the list. I have now switched that code to use: