/t5/lightroom-classic-ideas/p-letters-as-file-extension/idc-p/13377227#M17250Nov 28, 2022
Nov 28, 2022
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File extensions are what is written after the dot to specify the file type, such as ".jpg" or ".tiff". I assume you mean that you would like Lightroom to add letters instead of sequence numbers, so something like "originalfilename-A.jpg", "originalfilename-B.jpg"?