files TOO BIG for adobe AERO?????????

I created a 7.7mb file in Gravity Sketch, exported to Adobe Painter.  Add materials and colors.  Exported to Adobe Stager and tried to EXPORT TO AERO but everytime its bigger than the 50mb aero allows.  I've "cleaned" the files, reduced the texture size to 256, even tried basic materials with minimal textures, nmo shine, etc.   Any suggestions??????   Im at a road block.  Been researching and trying option after option for 2 straight day.  Thanks for any help.