To make life easier I’d convert it all to ProRes or ProResLT as you have mostly SD footage it seems. Make sure the frame rate is the same. Different timebases will really mess up FCP. I usually use png graphics these days, but jpgs will work fine. I’ve never tried tiffs, but they’ll probably work, too. Keep the pix at a reasonable size. You don’t want their dimensions exceeding 2000 pixels per side. Big pix can slow FCP down. If you’re not moving on the pix make them the frame size you’re using.
John
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