I sent boarding pass, hotel receipt, ALL pages of the passport, and photos of the paper visa and stamps (so can't comment on the electronic version), as well as a cover letter listing and explaining each doc - all in one, compressed pdf.
I applied for my children's in Jakarta and the only additional documentation they asked for was proof that they were in Indonesia.
Suggest you fill in most of the application prior, but only submit after arriving - to include copies of every passport page, entry stamp and visa, plus the hotel receipt.