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It's very similar to the Add records except we need a BLOB input for a PUT HTTP action. See attached.
The only real difference here apart from converting the JSON to BLOB is that we needed to add an ID for the row to be updated.
Let me know if there's anything I can help with. Remember that the Download data of the Download Tool will give useful information in the case of failure. Otherwise it just lets you know what was loaded.
Same provisos in this flow re API Token and Sheet IDs used.