upload_
I'm aware this post has been answered, but I've just resolved the same issue, so I thought I would add my findings to help others.
I needed to increase the PhpMyAdmin upload file size limit from default the 2,048KiB and I too changed the upload_max_filesize and post_max_size and memory_limit, but nothing changed.
It took my a while to find the problem, when I used the phpinfo(); script to identify where the PHP.ini file was it said was here: C:\Program Files (x86)\iis express\PHP\v5.5\php.ini, but I finally noticed in the PhpMyAdmin homepage that the Web server was running version: 5.6.31. So, I updated the upload, post and memory limits in the PHP.ini for both versions 5.5 and 5.6 and the import limit in PhpMyAdmin increased.