Yes, out of the box, max post size is normally 2MB. Some systems will have that a bit higher to allow uploads of larger files, but the largest one I've ever se

Yes, out of the box, max post size is normally 2MB. Some systems will have that a bit higher to allow uploads of larger files, but the largest one I've ever seen is somewhere around 50mb, with 4gb you'd either have to have a super large php-fpm setup where each process could receive 4gb requests and deal with them, plus you'd have to have the config adjusted to receive these large posts. The number of instances out there might not be exactly zero, but I'm pretty sure it's somewhere very close if not.