You cannot upload from a mobile device via Kaltura into a Canvas Course.  You will need to transfer the video to a computer and then upload.   One way is to move the video to Google Drive and then download the video to the computer.  Then upload via Kaltura to Canvas.

Upload video from iPhone or iPad  to Google Drive

Upload video from Android to Google Drive

Once the video is on a computer use these helps to upload video in an Canvas Assignment or Discussion Board