A Galaxy container is a temporary object. The only thing you can write to is /tmp
So you can upload and put some files there sure. But when you restart or upload a new meteor project, it’ll get wiped. That /tmp is only 500mb too.
You cannot install custom libs on Galaxy. You can’t ssh in to the VM to do things. Galaxy is a fire-and-forget for dummies type thing. Great service, but you’ll need cloudinary.com to save the day.