The users that having problem with upload button, please redownload the package, update yours, and read the documentation -> Creating Portfolio section.Thanks
Maxx – Responsive Creative WordPress Theme
Maxx WP is a Modern Clean & Creative theme suitable for any corporate business or portfolio,It’s created by using the latest techniques : HTML5 and CSS3. With a extremely responsive design That means it will fit any device (Desktop, tablet, smartphone…), completely optimized for your touchable device. Maxx has everything you’ll want for your business website.
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Comes with highly customizable theme Option Framework like you can change the skin easily, or define your own style, typeface, turn on/off responsiveness …ect.
Visual Shortcode Generator allow you to mix complex information into a post/page without coding knowledge.
Localization Supported (.po & .mo included in case you want to translate the them).
SEO (Search Engine Optimization) has been made a priority when building the themes.
And a Very detailed documentation guides you to use the theme quickly.