I recently upgraded to unlimited BB, partly because I wanted 50GB on BT Cloud. However it has taken literally weeks to upload about 20GB of files. I think this is just because uploads are very slow on regular broadband. Perhaps they are faster with fibre (not available in my area). I am quite patient. A less patient person might say that BT Cloud has been sold to regular BB customers, when it works so slowly as to be of little use.
Also my upload has now stalled "Uploading 1 of 52 files". I thought it might be one particular file causing the problem, but the program doesn't tell you which files it is currently uploading, or the order in which it uploads files.
Thanks for posting. Are you having general upload issues or is it specific to Cloud? Can you try running a speed test here and post the results including further diagnostics? Give us as much detail as possible and I'm sure we'll be able to help.