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@@ -866,6 +866,7 @@ Additional parameters available are:
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- `previewId`: the identifier for the preview file container
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- `index`: the zero-based sequential index of the loaded file in the preview list
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- `reader`: the FileReader instance if available
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+- `jqXHR`: the `jQuery XMLHttpRequest` object used for this transaction (if available).
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**Example:**
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```js
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