Concat(Table, Formula) Here a table can be anything like collection, Gallery.items, SP list data source, multiselected person and group field, or multi-selected choice field. And you need to create a concatenated string of value of column/item from these data sources -- then using Concat ...
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To change those records into a comma-separated list of data, you can use the Concat function. The function allows you to specify a formula to process over a table of data and the result of each record is separated by a string you specify. The reverse of this is also possible...