When uploading assets what determines the maximum file size? When I upload an asset I get an alert window stating my file size is to large. I have increased the file size in the general.php config file larger than the file size, however I keep getting a error. We are using AmazonS3. Is Craft limiting the file size, PHP or AmazonS3?
Craft itself, limits the filesize only in the maxUploadFileSize. Default: 16MB

However Craft gets limited by:

PHP: Has a few values which might cause the problem:


memory_limit
max_input_time
upload_max_filesize
post_max_size


AmazonS3: If not limited by a policy value, the default is 5GB.

User: Sometimes it can be just a Browser issue causing the problem.