As you've probably experienced, every email provider has different rules for size limitations, which means if a file exceeds the limit, you will be prevented from sending the attachment. 

For Gmail, that limit is a mere 25MB.

Back in my early days, that size would have been considerable. Today, not so much. In fact, I regularly have to send files that exceed that limit and do so with my Gmail account. Unfortunately, you cannot configure Gmail such that it will allow you to bypass that limitation. However, all is not lost.

Also: How to block someone on Gmail 

Thanks to Google Drive, you can still send files larger than 25MB via Gmail (or any email client for that matter). But don't think you have to switch back and forth between Gmail and Drive to make this work, as Google has built the feature right into Gmail and it's super simple to use. With this handy workaround, you can send files up to 10GB in size. 

You read that correctly