One of the method to send your attached copy of your documents through email.

I think this can be the solution of your problem ( but you can only send limited mb size of documents to university through email ) but I have the solution for that you can mail them through the Software named WE TRANSFER . You can share documents of size upto 2 Gb and i think this size will be sufficient for you ..

I am sharing the link of the software and I hope your doubt is cleared ..Thank You

https://wetransfer.com/