Include descriptive alert when uploading a new video

[jrdnbwmn]

Is your feature request related to a problem? Please describe.

This is about uploading a new video. When you choose a video file and start the upload process, the loading bar fills in, but then the upload form suddenly goes back to its original state, without any indication of what's happened. The first few times I thought this was a bug and that the upload had errored out. I checked my email later that day and realized that I had received an email that said my video was finished processing and now I could finish my post.

Describe the solution you'd like

After a video is done uploading, include some kind of alert that says something like, "You'll get an email when this video is finished processing."

Describe alternatives you've considered

Not sure. Just need some kind of indication of what's going on. A message seems good enough.

[github-actions]

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