You mean from within the smart object or from the pad where smart object is in? I have an extended version made myself for exporting layercomos from a main pad. Not with link pad actually. Quite interesting idea actually. Currently photoshop can save different layercomps per pad and also allow you to use with layercomps system in the main pad. Prior this function wasn't available, so I either relinked the same pad file and choose different layercomps in the smart object and then save a layercomps of that in the main pad But since that new layercomps setting is available for best smart objects. I've run into issues where photoshop behaves weird, lags and other issues. If I remember well. I've turned it off and never used it again actually. Other times when I need this for a say a mockup. I have a couple customized scripts for relink smart objects from a folder. Depending on the need, I have different versions of the script. One simply relinks, adjusts size to layermask and exports. The other actually relinks and downscales to original pad file. That way you can minimize cutoffs and other issues. Downside it's slower. It needs to open, relink, save, close, then export. The first script, relinks, scales, relinks. Much faster
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