Though in some cases it may take little longer time, it is very rare that the video never loads.If an issue like that happens, you can submit a proper bug report in GitHub with details, or from their in-app bug reporting process.

I remember once that the video never loaded.I went to their gh repo to find that the issue is already known, there were some api changes from google side.

Worth trying again, I use it daily and have never experienced that.