where are the pix/vids ?

[MarkinLA]

Hi all. i just became a member a few days ago !..I don't seem to understand what the steps are to view pix/vids. I go to a post which displays them. But nearly every time I click them, 'photo unavailable' comes up... I love seeing layouts and their trains. What steps am I seemingly missing to accomplish this ? Where do members' shots open up whether they be stills or YouTube vids..? Might it be because I'm still a hobo in the group ?
Thanks, Mark, Los Angeles