There are file size limits for various file types. When you click 'Manage Attachments' there is a chart provided for reference. Even with JPG files you are limited to 781.3 KB. See attached image.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |