Uploading 50+gb files

I apoligize if this has been posted before but I only had limited time to look and didn't quite find what I wanted so here goes. 

I wanted to upload a 60gb file (2k raw footage is a beast) for a colleague. However, the website caps uploads at 50gb which is understandable. But when I finally downloaded the app, which was difficult in and of itself for some reason, it just opens the placeholder files in file explorer and when I try, as instructed, to drag that mammoth file into the dropbox folder for an uncapped upload, I don't have enough storage space on my computer and deleting that much isn't an option. Am I trying to do this correctly? Is there a way to do this without taking up 60gb on my computer's drive?

Thanks to you all in advance!