Dropbox will not recognize my external hard drive

I recently just did migration assistant and am using a new laptop. same type as before. 

My external hard drive (g-drive) worked on dropbox before. However, now it does not ask me if i want to back up the device when i plug it in. there apparently is NO manual way to do it either??? I think i should note that i recently deleted the G- utilities partition, because it always popped up on my computer when i plugged my hard drive in and didn't seem to hold anything, i now know that that is what makes it compatible with windows. However, i did not think i needed that anyways since i only use Mac.

My external hard drive is formatted as Mac OS journaled.

Someone please help me, this is driving me nuts. i've talked to dropbox support 5 times and nobody is helping me.