I think the default is Public, and you have to go in there to change it. If I had it set to Public or Unlisted, applications that don't allow setting visibility would upload and the videos would default to those (if I had them set that way). I typically set mine to Private, so any application that uploads without giving options typically defaults to that so my videos would all upload Private by default unless the application gives me an option to change it in the upload settings. There's a default channel upload Visibility set there on the bottom. Go to YouTube Studio -> Settings -> Upload Defaults | Essentials Unless the application includes that setting by default when it uploads (just doesn't let you change it - but I have no issue with that scenario Private-by-Default is a totally acceptable stance to take). What are the default settings on your YouTube channel? If it's Private, then the video is going to be private given the lack of an option to change it in the application uploading the video. So good start, but needs expansion and improvement.

Also, maybe if possible a Thumbnail image option so the Thumbnail image is updated on Vimeo and YouTube. Don't want the video to be public right away without having changed these things first. Next, please allow an option to have the uploaded video be private so that we can change the Title, Description, etc. Then I'd like to be able to change the data rate.

Also, custom resolution doesn't allow you to enter a custom resolution at all at the moment. but, there needs to be more customization with the settings.

Youtube upload defaults