Embedded videos not displaying on page

I am building a wordpress site related to a rare disease that I have. On one page, I am listing a number of videos related to the disease. In total, there are 34 videos. I have the videos embedded into the page and I’m using the and tags to hide the videos until the user clicks the summary link. The issue I’m having is that the videos often don’t load, even after clicking the summary link. I’m new to wordpress and not sure if this is a wordpress issue or if it’s caused because there’s so many videos…or both. Does anyone have any idea what the issue might be and how I might fix it? Thanks.