I can't find what file systems for a USB stick my Android TV supports, wondering how to discover that

I just bought a new Smart TV, FOX 32AOS430E, to be precise and had some issues with it the other night with my USB drive. I needed to put a large movie on the USB drive, over 4 GB, so I formatted it to ext4 and then when I tried to open it in file manager, it says can't connect to USB. So, I reformatted to ExFAT because I read that Android TV supports that format, alas my TV doesn't, or at least my file manager doesn't, and then I try another flash disk in the end that was Fat32 and that one worked. I can't put my huge movie on FAT32 and can't find anywhere what formats the TV supports, I guess it's not as common as Sony or others, not even a manual online other than what I got in the box. Edit: I tried ext4, the TV couldn't connect to that one, I have Linux, that's not an issue, but I refuse to believe that Fat32 is the only supported system?