@EternalDarkness actually somebody can see an unlisted Post in your post. Especially if you made a successor plane from it and then you go back to that original plan from the successor that you made public. If that makes sense.

Thanks @cowelly

How come nobody has upvoted this post yet? The advice given in it is excellent and certainly taught me about this subject :o)

Ok thanks @EternalDarkness

When uploading the plane, you have a button saying "public" (in-app, you can't change it after you upload). When you click it, it turns to "unlisted", and makes your uploaded plane visible only to you. You can find your unlisted plane on your profile, among "posts". Nobody except you can see it.

Oh I don't know how to do that @KingDeadshot