@jja, if your gallery in a Canvas App which I assume the to be the case, you can use a collection to hold whatever columns you need from the gallery. Then you pass the collection as a parameter to the flow.
You would basicly use the ClearCollect function right before your run the flow in the Canvas App to get the Gallery.AllItems. You can then pass the created collection using DropColumns, to remove the unwanted columns. Something like this:
ClearCollect(colToPassToFlow, Gallery1.AllItems);
YourFlow.Run(JSON(DropColumns(colToPassToFLow,ColumnName1 [, ColumnName2, ... ]),IgnoreBinaryData))
Regards,
Ahmed
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