easy if you are willing to use the tablet side for the annotations.

1.Put the file in dropbox.

2.Go to dropbox and tap on the file. When it ask you what program to use choose ezpdf, repligo or whatever you want.

3. Make your annotations.


Thats it. Dropbox will automatically send the pdf back to the server as soon as you change it.

OR
just you can just use the "send" option in repligo and send it to dropbox manually.