I was about to upload an app to iTunes connect, but the application loader has been stuck at the stage of \"Verifying assets with the iTunes Store\" and pending for almost a
I recommend not to cancel.
The process seems to be stuck, but for my part waiting for 10-15 minutes finished with upload success.
Cancelling will most likely result in builds on iTunes Connect that will never finish processing. They will only be removed by iTunes Connect internal auto-cleanup after approx. 15-30 days. The downside is that it is not possible to use any build for that version number for internal testing in iTunes Connect as the indefinitely processing build version is the only one listed to choose from. The only way around is increasing the build number and you can choose it for external testing.