i can't upload file more than 4G

hello,

please i have an issue with laravel ...

the issue is when i upload file 4G it is uploaded fine with any problem but if the file large than 4G Laravel redirect to upload form with validtion error under upload filed

The Storge_Key Filed to upload => Storge_Key is the name of upload filed ...

please can any one help me ???

this is my issue image https://preview.ibb.co/hUoS8w/Screen_Shot_2017_10_03_at_1_48_43_AM.png

BWT the Uplaod file to Cpeh Storge looks like S3