updateFileMetadataValue method
Since v0.7 Update the value of a single metadata key. If the key does not exist, it will be created
Implementation
Future<String> updateFileMetadataValue(
String fileId, String metadataKey, String value) async {
_ensureRightVersionForMetadataApi();
final request = createRequest(
'PUT',
buildUri('$apiUrl/files/$fileId/metadata/$metadataKey/'),
)..body = jsonEncode(value);
final result = await resolveStreamedResponse(request.send());
return result as String;
}