Cross-platform, Acrobat compatible PDF highlighting in Ubuntu, Android and Mac OSX on Dropbox

I have a Mac as my notebook, Ubuntu 12.04 LTS as my workstation, Nexus 7 2 (FHD) as my tablet and an iPhone 4S (ios 6). I want to read PDF documents across devices and highlight for later. However, I ran into some difficulties in various aspects. Here are some issues I noticed.

1. Google drive does not let Android edit files. This is a deal breaker because this means I cannot highlight as I am reading on my Nexus 7. FAIL
2. Okular maybe a competent PDF reader, its highlight functionality is application specific. FAIL
3. Skim on the Mac OS is the same way: application specific highlights. FAIL
4. Dropbox PDF viewer does not display highlights. FAIL
5. Opening a PDF on ios (using "Open in..." function) automatically makes a copy of the file, and, thus, will not save back to the original. FAIL

Here are some work-arounds I used to remedy some of the issues:

Nexus 7 (Android):

1. Use Dropbox. Android app allows edits on mobile devices
2. Use Acrobat to highlight

Ubuntu 12.04 LTS:

1. Use PDF-XChange under Wine in Ubuntu. It works like a charm. There also is a portable version available for download on CNET.
2. Wine program launcher can easily be created using Wine Launcher Creator (WLC). It is available here.

Mac OSX 10.8.5 (Mountain Lion):

1. Use Preview to highlight

I don't know if I will be able to find any workaround for the iPhone. The fundamental design of the OS seems such that I cannot modify the original file. Oh well. I can still view highlights by opening a copy in Acrobat.