Dropbox does upload your photos in full resolution. However, when photos are previewed the Dropbox Android app shows a scaled down version for faster loading. If you'd like to view your photos in full resolution, you can export the photo(s).
Hope that helps and have a great weekend!
Re: Dropbox just shows me compressed low resolution previews on Android
Thanks for your reply. I understand the efficiency in scaling down and compressing the image for fast preview. But why is the resulution lower and the compression higher on an Android device compared to an Ipad? The strange thing is, it looks like this is a recent thing and before the quality seemed a lot better. Exporting is too much hassle, I switched to Google Drive because my photo's look great when previewed there...