I know I'm a bit late to the party here, but I just figured this out. When attempting to edit metadata you'll need to edit the metadata object that the properties object contains. e.g. "properties":{ "metadata":{"myVar":"Val"} }. So your request body would actually need to be "properties":{"metadata...

Oops, apparently I never tried to edit the metadata object within the properties object that I get from the GET request. That was the solution.

Hello,I'm trying to access an asset's metadata through the REST API. I understand that metadata is stored as XMP on the actual file. If I make an Edit Asset request as described here(https://helpx.adobe.com/experience-manager/6-3/assets/using/mac-api-assets.html​) and attempt to edit a property name...