I tried uploading attachments, but it failed. I will try later and send you the error message.

I found the gallery works, so now I just use that!

If you can send the error message that will be great. How big were the files you tried to upload? There is a 5MB per file limit, so if you were uploading large images that would be a problem. The gallery has a 50Mb limit, but will resize large images down to a max of 1024x768 so is able to deal with larger images much more gracefully.

I think thats the problem. They were larger images!

If you resize before uploading it should work. The gallery is much more useful for this sort of thing though - you can repost the links in the blogs, forums, and also on other sites and it's still only taking up the space of a single image, whereas uploading as an attachment to multiple blog and/or forum posts takes up space for every copy uploaded.