I’ve had a similar issue however I’m trying to populate the asset’s keywords field. I’ve set metadata to 1 and tried posting a field ‘meta_img_keywords’, ‘meta_keywords’, ‘img_keywords’ to no success.
We’re using the Hosted version. I’m uploading via the API V2 using PHP/CURL. The assets show up on our account as expected but without any keywords attached to the asset.
My Debug email report has these lines which show the posted fields are arriving but not working apparently.
meta_lang_id_r is set to 1 explicitly though I noticed when I didn’t include it, the debug report showed it as 1 by default also. “untagged” is my test keyword field to see if it populates as expected. It is just a string being passed by my script. I used untagged2 and untagged3 so that if they keywords field was populated, I knew which “field” it came from.