If you are not using your mobile phone to post a trip then you have an option. if you are using desktop site, on every enter you press on the draft window you will see a plus icon. cluck it and yiu will have various options to add photos, video from insta or YouTube or even Facebook.
Once you click on your tripoto profile go to right upper corner publish trip there you click you will get 4 option click on the upload video option and paste your you tube link and upload use your desktop browser not the mobile device