There's a bug with the attachments viewer on the forum I think which is why some screenshots are coming out the wrong size/tiny. I think if you make sure you save the screenshot in jpeg format, make sure it's named .jpg and then upload it, it should come out at the size you uploaded it at (as long as it's not very large in which case it gets cropped, but it shouldn't be tiny like some peoples have been).
I think what is happening with the tiny screenshots is if you upload a .png file, it gets saved as a jpg file incorrectly by the server and then displays at the wrong size.
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