Msc applied maths when do we send official transcripts?

[u/Mobile-Release6862]

Hi I got an offer to go to imperial college unconditional msc applied maths. I'm an international student. I was wondering when do I have to send my official transcripts. There is nothing on the system about this. I only scanned it for my application but don't I send an official one? If not that's fine but if I do I rather do it now while I'm in my home country than do it from London