Hi Chris, I've read through the forum posts on this issue and couldn't find one that addressed whether my understanding of syncing a directory and its subdirectory is correct. So just wanted to post an example. Sorry if I didn't read the previous posts correctly Assume initially: Directory1 |-- File1 `-- Subdirectory1 |-- File1* where (*) indicates the newer of the two File1's and is not actually present in the file name If mysync is called with Directory1 and Directory1/Subdirectory1, my understanding is that the final file structure will look like the following Directory1 |-- File1* `-- Subdirectory1 |-- File1* `-- Subdirectory1 |-- File1* Can I confirm that this is indeed correct? I'm finding it hard to test this using the sample solution, as I'm unsure if there is a way to link the two input zip files to demonstrate the relationship that Subdirectory1 is a subdirectory of Directory1 Any help and clarity would be much appreciated!! Thanks