It is possible to add drawings, both on the original video as on a playlist.
Whenever a drawing is made on the original video, that video will be saved as a playlist. The original video thus will be kept.
drawing created on an original video
drawing made on a playlist
General info: user functionalities depend on the roles & permissions settings. If a certain functionality does not work within your user account, this will be because you don't have sufficient permissions for this.