@annhigh With the trim feature you can only cut from the beginning and/or from the end a piece, not in between. If you save your edit, the original video is replaced with your shorter video. No way back! No Backup, no copy, no new version, ... You can try to open a ticket to Microsoft, if you are quick and hope Microsoft can restore the video, but I would say there is no change.
To cut pieces from inside the video you have to download the video from Stream, edit it localy with a video production tool or the Windows 10 integrated Video Editor and reupload it to Stream.
