If alteryx can't create a .yxzp file from your workflow - it won't be able to upload to sever. It seems to have an issue with one files name. I'd recommend trial and error to figure out which one can't be included in a .yxzp - and then changing the name of that file. If you post this on the Designer thread vs the Cloud Designer/Trifacta thread - you'll get more of a response.
Polls
We’re dying to get your help in determining what the new profile picture frame should be this Halloween. Cast your vote and help us haunt the Community with the best spooky character.