Opening older After Effects project in newer version, assets are completely black or missing
I'm opening AE project files made on the 2021 version in the 2024 version. Whenever I open them, the message "This project must be converted from version. The original file will be unchanged"
Opening the project, all the uploaded movs and image files I added don't show up in the preview, or are completely black. I did follow this tutorial to try and fix the issue, but not only did it not fix the missing assets, but made one of my other projects more confusing. Previously it was entirely black, but now it has these colored squares where the assets are supposed to be.
Should also mention that I tried following the tutorial yesterday, but it repeatedly caused Adobe to stop responding.
Here are what my project files look like in both versions



