Processing When Posted
After uploading is completed, platforms optimize the video for ease of playback and minimal necessary storage. Not needing to leave the draft opened while the video processes saves the user the mental energy of needing to come back to it once completed. However, while it's processing, the post will not get published and can be returned to a draft state if the user realizes they uploaded something incorrectly.
Failed After Posting
Most platforms are able to catch a bad file before it gets posted. However, in the rare situation that it's not caught, or that a user edits an already published post, adds a bad video to it, and hits save before the error can be caught, we need to display that something went wrong. Users are then allowed to go back and edit the post and remove the video.
Uh oh! Something went wrong with the video you tried to upload. Please try again!
Successfully Posted
When the video is done processing and the post is successfully published the video appears in all it's glory on the page and allows for embedded playback.