First off all, Welcome to Tripoto 😊
Mainly Tripoto is a travel forum.. You can share your travel experience and you can also share photo blogs. But you can't post videos directly here, you have to upload your video on You Tube, then share links..
For posting videos, you can only upload the link of Youtube over here. And about the pics, it should be related to the blog that you are writing and also make sure its recommendable to share the public pics not private one.
You can post the following:-
1)Blog with writeup and pictures
3)You cannot upload videos but yes you can share URL’s of link if they are already there on youtube.
You need to go “publish trip” option...and then click on “create new”.You can additionally import your already available blog using the “import blog”option.