Update uploader.md onBeforeUpload event #675
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Description
I've found some information scattered around the web about this UI element but the documentation doesn't mention this event and even more intruiguing is that it doesn't really work as I would expect it to.
I should be able to validate files (like exceeded size, fileType) before even allowing user to click "upload" button. That's not the case and I've already got davin to write some code:
box/box-ui-elements#3841
Checklist
yarn lint
to make sure my changes pass all linters