Bernat,
Of course you should consider to upgrade your SP from time to time. Bugs are fixed, new thing are added, for example the onUpLoad attribute.
No, for your problem you don't need a new SP. All you have to do is add an additional <htmlb:button> to trigger the actual upload. This is what the onUpload attribute does. It just renders for you an additional button.
Please look at SBSPEXT_HTMLB/fileUpload.bsp for an example. Also recommended is that you look at the online documentation. Select the tag, and press F1.
brian
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