Huh, ok. Last time I tried I assumed the file manager issue was because I used the xl file on my non-xl, but maybe it was just the file manager I was using that was the problem.I don't think it's much different honestly, it SHOULD still work the same. The original XL and 2 XL are significantly different and it works fine, I have also used the APK from the normal Pixel 2 on my XL with no issues.
I'll give it a try and report back if I have more issues, thanks for all your help!