Typically, raw photos from a digital camera can be huge in file size and need to be "optimized" for the web. Optimizing them cuts down the file size without sacrificing photo quality - at least that's the goal when done right.
Web browsers usually only recognize file types of .jpg, .gif and .png. The best file type for a photo is .jpg. (Graphic files use .gif and .png.)
I use Photoshop for optimizing photos, but that would be overkill for you.
Maybe your camera came with some software for optimizing photos?
You could also try this free online service
http://webresizer.com/
If that doesn't work, since you're having trouble uploading and they may not upload there either, here is a free program you can download.
http://www.irfanview.com/
Tutorial
http://www.peddlergraphics.com/optimize.html
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