GIMP Version: 2.8.2
Operating System: Mac OS
OS Version: OS X 10.82
GIMP Experience: Beginner Level

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I am trying to edit an image.
First trick is to download the .xcf file here.
Can someone tell me how I do that?
I have saved it in .xcf format but when using any of the tools in the tool bar above (upload file or insert image) it doesn't give me the option for this format!!

You can attach xcf file, look at the box below Preview Submit Save Cancel panel on the bottom of comment box.
It's under Upload attachment. Choose file from your computer and click Open.
If xcf file exceeds maximum allowed size (5 MB) you can zip it, 7z, etc.

Let's see if this works

no image!! ????

you want show the image or you want attach the xcf file ?

To show you should export as jpg or png, to attach should be no problem except that 5MB limit , xcf files are large so you may need to zip it