Ensure the file on your computer is named exactly: Avengers.Endgame.2019.720p.BluRay.x264-DRAYS.mkv
Do not rename it if you want to keep the scene release identifier; TeraBox supports long filenames.
Filenames in this format follow a standardized naming convention used in the "warez" or file-sharing community to convey technical details at a glance. Ensure the file on your computer is named exactly: Avengers
While free tiers of other services cap uploads at 250MB or 2GB, TeraBox allows you to upload the entire Avengers.Endgame.2019.720p.BluRay.x264-DRAYS.mkv (approx 3.5GB) in one go. Ensure the file on your computer is named exactly: Avengers