I filled out the form before and they have witheld taxes @ 5% on US sales
I think that is correct for tax treaty between Australia and US.

I looked on my details and there was a button to "redo" tax forms.
Is that for if I want to change some details or do we have to redo it every calender year ?

I like that they pay out whatever amount left over at the end of the year. Very fair.

I don't like that I haven't got a single view in 1 month with a portfolio of around 250 photos.