ファイルから電子すかしを削除します。
curl -X DELETE https://api.box.com/2.0/files/12345/watermark \
-H 'Authorization: Bearer <ACCESS_TOKEN>'
await client.FilesManager.RemoveWatermarkAsync("11111");
BoxFile file = new BoxFile(api, id);
file.removeWatermark();
client.file(file_id='12345').delete_watermark()
print('The file watermark was deleted!')
client.files.removeWatermark('11111')
.then(() => {
// removal succeeded — no value returned
});