ONLY jpg are allowed on ecrater. All images on ecrater.com must be uploaded to ecrater.com.
Hope that helps!
BTW, did you know ecrater.com has their own community? you can find it by going to www.ecrater.com and click on Community at the top of the page. Your login and pass word are the same as your store.
IF there's anything I can help you with regarding ecrater.com Just holler. I been selling there for a year and a half and absolutely love it!