In case developer wants to use this feature, he/she will most probably want to hide the uploads internal submit button by setting its caption to null with {@link #setButtonCaption(String)} method.
Note, that the upload runs asynchronous. Developer should use normal upload listeners to trac the process of upload. If the field is empty uploaded the file name will be empty string and file length 0 in the upload finished event.
Also note, that the developer should not remove or modify the upload in the same user transaction where the upload submit is requested. The upload may safely be hidden or removed once the upload started event is fired.
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