This happened to me all the time, I THINK what you have to do is crop the video you want, then copy the cropped video and post that one

Same , that’s why I want posted a unexported video

No clue, sounds like your editing isn't actually saved or exported as a file, or at least not to the place where you expect it. So when you pick a clip to upload, you're actually picking the one you were just working on. Before you upload the file, watch it to make sure it's actually the one you want to upload.