Another thing with server I had to figure out painfully.

I always got the error message that my video was not between 250K and 40960K big.
Spent a lot of time to increase limits in PHP, nginx or through artisan tinker. Tried a 100M video and it still complained it wasn't between 250K and 512000K.

Had to dive into developers console to realize, the error code was 422 because there was not video uploaded. Transcoding failed in browser.

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