Not that hard, start upload as public and change it to scheduled after you add the video to a playlist and update all the information.
Or simply optimize your playlist to automatically add videos based on specific rules, ie a specific tag or something else, and make sure all videos that need to go in that playlist have the tag that's needed.
Just add it to the playlist when it's still uploading. There's an "Add to playlist" button right there during the upload. I always add everything to the appropriate playlist immediately while it's uploading, then change it to scheduled once it's uploaded and I've finished making the end screen.
Same here. Everytime I tried to add while massive uploading, they appear in playlißts as massive private on top of playlist until day scheduled to be published. I have tried with no success to upload as public or unlisted but they still appear in p!aylists as private.