Why is my export suddenly 10x bigger

Okay I am pretty green to CAD so I hope this a simple basic answer.

I work on an IPadOS (10.5 iPad Pro) and I work strictly in mm.
Specifically custom jewelry. So my problem is this.
Typically when I export a mounting, for my biggest project has never been more than 2-27 mb. But I have what I would argue is one of my most simple but is exporting to 60mb! I’m really pressed on how I am supposed to email this file to my casting house when it is this big. I could go through a cloud service but I rather solve the issue. Edit* Attached screenshots for comparison
Any suggestions?