Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Also running into this issue on my iPad Air. Ditto on iPhone (5s) seeming fine.
You may only upload PNG, JPG, or GIF files (max. kbs.)