In order to provide efficient email service for our clients, we now offer a large Maximum message size of 25MB per email.
If you need to send large files, or know of a person trying to send you large files over 25MB who is getting blocked, don’t worry, there are some easy ways to get those files to the intended recipient.
Best Ways to Send Large Attachments
The best way to send large email attachments is to upload the file to a cloud storage service like Google Drive, Dropbox, or OneDrive and then email the shareable link to the recipient. This method bypasses email size limits and allows you to control access, for example, by adding password protection or an expiration date.
Yep, that last sentence was directly from google.
Check out what they have to say in more detail: Google best ways to send large email attachments