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A Media Item is rendered via its "display-on" page. The language of the Media Item decides the language version of the display-on page. Therefore ensure that display-on pages are available in all different languages.
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Response
Successful responses
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Still, if you look carefully it can tell you that a field name idsxxx was used in place of one of the valid ones listed, including ids.
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Settings
There is only one setting for the API in the Setup Tool ("/web/setup"), but it is an important one, since its checkbox must be checked to enable access to the API. The setting is called:
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