Help Fix A Few Coding Bugs

I am looking for an experienced PHP programmer who has knowledge working with Gmail's API, Amazon S3 Bucket and sending large attachments (max 25 Mb) through Gmails API. I have a script which I have written in PHP, AWS and Gmail. There are just a few bugs that just need to be worked out. Currently my script is having an issue sending large attachments via the Gmail api - which Google clearly states in their Doc's. I am getting a "Request Entity Too Large Error 413" any time I attach a document or a collection of documents over 5 MB in size. All email attachments are currently 1st being uploaded to AWS and then a user can choose which attachments they want to send via the email script in my app. Here's what I would like for the script to do. I am open for you as a developer to give me as much feedback as possible or even offer a different approach to sending attachments. 1st - the user creates an email draft in my app - (this is already taken care of) 2nd - the user uploads any attachments they wan to send with their email - - (this is already taken care of. All files are uploaded to AWS). Last of all the user hits send on their email draft inside of my app. The script then grabs the preSigned URL's from AWS and includes the documents into the message before it sends it out via the Gmail API - this is broken and needs to be fixed. Currently my script will send email fine with less than 5 mb of files attached. Once it goes over 5 mb the script returns the error "Request Entity Too Large Error 413". I will send you my script to analyze.