We have recently uploaded another patch that is working for a lot of people, so can you please try uploading your zip file again?
Also, we have reinstated the 3rd party link option, so if you still cannot upload zip files directly you can provide them via a Dropbox/Google Drive/etc. link until we have found a fix that works for everyone. To do this, click the name of the beat in Beats > My Beats, and scroll down to where it says 'Trackout'- you can enter your link here
Sorry again for any inconvenience caused, and thanks for your patience whilst we look for a solution that works for everyone