Sketch Cloud

Anyone else having a problem using Sketch Cloud?
So, we use sketch cloud, prototyping, and upload to sketch cloud…
However, the upload to cloud seems to take aggeessss… and also, we have noticed the if you have a symbol in a symbol in a symbol… it shows blank screens or sections as such… (we can get round the symbol in a symbol type scenario)

Anyone else having these problems, or know of how to get round the uploading issue?