Hi,
I tested it,
I upload a file of 2 MB with resolution 1600x1200 no problems.
I upload a file of 400KB with a resolution of 2048x1536 a received "could not communicate with the server"
I checked all the server limitation (I found 3) in my server and they are all at 16M.
The test prove it! It's not the size but the resolution that cause problems.
I don't have the help doc but in the section troubleshooting there's a case that suggest to downgrade the resolution of your picture if you have the "could not communicate with the server" problems.
How can this issue be corrected?
Thanks