This is a server setting issue, Digital File Pro does not have any limits that it imposes on file upload, any limits will be set by the server.
The setting changes you have made should allow the upload to work if they are actually taking effect, bear in mind that just because the phpinfo verifies your changes, that doesn't necessarily mean they are not being over ridden by other settings on the server level.
in IIS 7 you may need to edit the system configuration to allow large file uploads:
IIS-7-needs-extra-configuration-to-allow-large-fil