I ran a little php info file and got.
Server API Apache 2.0 Handler
Virtual Directory Support disabled
Configuration File (php.ini) Path /Applications/AMPPS/php-5.6/etc
Loaded Configuration File /Applications/AMPPS/php/etc/php.ini
Scan this dir for additional .ini files /Applications/AMPPS/php-5.6/etc/php.d
Additional .ini files parsed (none)
This showedI was editing the correct file.
upload_max_filesize = 512M
max_execution_time 3600 3600
max_file_uploads 20 20
max_input_nesting_level 64
unserialize_callback_func no value no value
upload_max_filesize 512M 512M
upload_tmp_dir no value
This seems to show my changes were actually saved to the file.