[Zanders' mom]

Hi, there is plenty of good advice here... hopefully something here will be to your style.
It is a good idea to have the crate near you when you are at home, put a treat inside the crate, so the pup can go look for it, and gets the picture that the crate is a nice place, play a little fetch, put the toy in the crate have your little one go get it out of the crate. Maybe even put the food bowl in the crate to encourage going in and out of the crate.
If the crying persists when you are gone to work, maybe the little pup would be happier in an exercise pen, I would put a heavy clear plastic (sold at fabric stores) on the floor wider than the xpen, place the xpen over the plastic (to protect floors), put a washable pipi pad in the xpen with a bed across from it, a water bowl, toys, give it time to get used to that, by putting him in for short periods at a time, increase the time gradually.
I wish you luck.