Add section on Set Once/Set Always fields #5421
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Proposed changes
Amplitude's docs mention the following on user_properties operations:
"You can't mix user property operations with actual top-level user properties. Instead, include them inside the $set operation. If you are using one of these operators then this dictionary can contain only user property operations and you can't combine it with the above format. For example. you can't do {"$append":{"interests":"Music"}, "subscription type":"paid"} in the same request."
Add section to docs that calls out this limitation and how to circumnavigate it when using this destination.
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