All of my pics auto upload for me. To include screen shots and any images I download off the internet. I haven't done anything special but I do place them all on my sdcard and not in the internal storage so that may make a difference.
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Hmm I wonder what the problem is then. I am using the internal storage so that could be it. Did you freeze any bloatware using Titanium Backup by chance? I'm hoping that's the culprit here, although I have no idea what I'd have to unfreeze to get it to work.
If you need to automatically upload images, screenshots to clouds you can use android "FolderSync app". But free user can only select one folder with one cloud, paid user can connect multiple folders, with multiple cloud services.