When you review a quiz attempt, then under each question, you should see a history of their responses. That will show you fairly accurately when each file was uploaded, I think.
Quiz
Quiz
ဆွေးနွေးပွဲ သော့ခတ်ထားသောကြောင့် အကြောင်းပြန်၍ မရတော့ပါ။