File upload limits « Gravity Support Forums

I need to upload large files (100MB) using my form:

I've modified the php.ini file so that:
max_execution_time = 600
max_input_time = 1200
post_max_size = 128M
upload_max_filesize = 128M

I can't find anything else to try that your other threads suggest. I've checked with my host that all the settings are ok and they say yes - they're not imposing any limits and this should work.

The form will upload files up to about 20MB (trial and error to find out) but anything large and it looks as if it's worked - i.e. the browser goes through the whole upload process, counting off up to 100%, and there's no error message - but there's no confirmation message either and the form just re-loads itself.

Please help!