Having a strong reliable internet connection is very important to ensure your interview questions are uploaded efficiently.
Whilst 4G uploading will work just fine we recommend using a decent Wi-Fi broadband connection.
We don't recommend using a public open Wi-Fi due to potential security risks and upload speeds which could be severely restricted.
If using a computer (PC or Macintosh), a hard-wired connection to your internet will result in faster uploading.
Also take note if your internet provider throttles your upload speed at certain times of the day. If so it may be useful to take your interview outside of these times to ensure a faster upload.