portfolio

Pinnacle 1.3.6
The problem I am having is using the portfolio. I chose the portfolio type, added 4 pictures, did project layout (above), chose carousel slider for the portfolio option. Published. Everything worked, except when I went to view post on the portfolio item the picture does not show. What is the maximum pixels, one should use? I tried all sizes…
It does show a brief broken circle like it is trying to load the pic.
Is there a step I am missing?