I don't see an attachment.

The concept is achievable and the interface to allow you to select an order could be done a few different ways: vba userform; multi-select file chooser; input list of filenames in table/excel/etc. You might also need to start replacing the pictures from a particular point unless you are really sure about the completeness and correctness of the chosen order.

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Andrew Lockton
Chrysalis Design, Melbourne Australia