There's nothing stopping you from using a 4K video, you just won't see much difference in most cases. As for the cropping, I just did mine in Vegas Pro 17.
Check the encoding of your video. If your computer doesn't have codecs for the H.265 format, and you're using that, it won't appear. Also make sure it is an MP4 and not any other format and that you named the file the exact same as the default one that comes with the mod. Also, just to make sure, the default video works fine right? That one is encoded to H.264 which is supported by default on Windows.
If this still doesn't work, try installing the basic version of the K-Lite Codec Pack: https://files2.codecguide.com/K-Lite_Codec_Pack_1880_Basic.exe
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Also, just to make sure, the default video works fine right? That one is encoded to H.264 which is supported by default on Windows.
If this still doesn't work, try installing the basic version of the K-Lite Codec Pack: https://files2.codecguide.com/K-Lite_Codec_Pack_1880_Basic.exe