The "Failed to upload video" error is displayed in the step (or cover) on the editing screen if video upload fails.
*"Delete Video" or "Swap Video" are the only operations that can be performed for a video that failed to be uploaded. You cannot rotate video, replace thumbnails, or edit it.
*If you release (or update) the manual after video upload has failed, the video cannot be played back.
Please check for the possible solution to get around the issue:
In case issue occurs immediately after a video was uploaded
Try to delete and re-upload the video, or replace it with another video.
▼Replace manual image or video (Web Browser)
https://teachme.jp/8/manuals/8081560/
In case issue occurs after a video was edited
Try to delete and re-upload the video, and then add captions, symbols, or frames using an app other than the Web Browser version of Teachme Biz.
In case you have a PC
・Launch Windows Desktop App and edit the video
▼Edit video (Windows Desktop Application)
https://teachme.jp/8/manuals/3205105/
In case you have a mobile device
・Edit video using mobile app
▼Edit video (iOS version)
https://teachme.jp/8/manuals/8084803/
▼Edit video (Android version)
https://teachme.jp/8/manuals/8084822/