Can I override iFrame links in a symbol with a collection item

I trying to build symbols to reuse in my portfolio where I will want to be able to override the iFrame video link. So my thought was to create a collection with all if my iFrame video source URLs. The two issues I am having are:

  1. I’m not seeing a way to set the Video Source in the iFrame code editor as an override component. Is it possible to set the Video Source as an override where I select from My collection items (video URLs)?

  2. Might be related to problem 1. When I point my video component symbol to grab the video URL from my collection it works as expected. The problem is when I add a second item to my database it automatically adds that video into my symbol. How do I just grab one item from my database per symbol?

This link talks about iframe collection items and gets me almost there.

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