You have Dispatch AmazonS3 set up and have set your Max size to a large size, but for some reason the stack wll not allow you to upload a file of around that size. The main reason this happens is because most servers have a max upload limit. To get this to work, you will need to contact your provider and ask them to bump up your max to the size you want people to upload to your AmazonS3 server.
Depending on your host, changing these two PHP variables can be done in a number of places with the most likely being php.ini or .htaccess (depending on your hosting situation).
For example, to increase the limit on uploaded files to 10 MB:
Add the below to the relevant php.ini file (recommended, if you have access). Note that for some hosts this is a system-wide setting. However, for hosts running PHP as a CGI script with suexec (for example) you may be able to put these directives in a php.ini file in your web root directory.
upload_max_filesize = 10M
post_max_size = 10M
Add the below to your .htaccess file in your web root directory.
php_value upload_max_filesize 10M
php_value post_max_size 10M
The PHP documentation states that the memory_limit setting also affects file uploading. Generally speaking, memory_limit should be larger than post_max_size.
Its recommended that you consult with your hosting company about these settings if they are not working properly.
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