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Zapier Collection Array

Hi folks,
Can anyone help me with this Zapier question - i’m trying to create a new collection item and reference (via Item IDs) multiple items from other collections. The zap works when referencing a single Item ID but fails with a CSV.

For example:
5e8265527405842cec322281 = ok
5ede927dfaf4335b925c994e,5e826531c487583fb92a9cf7 = error

I’ve tried putting in quotes, square brackets but no luck.
Thanks,
Neil