If you want to add attachments in Gmail and Inbox that are larger than the 25MB maximum, for example, videos, you can save these large files in Google Drive, then insert the link into the Drive file in your email.
Insert Drive files in your Gmail messages
Step 1: In Gmail, click COMPOSE.
Step 2: In the Compose toolbar, click Drive icon and choose your file.
Step 3: Click Insert.
Step 4: When your message is ready, click Send.
Insert Drive files in your Inbox messages
Step 1: In Inbox, at the bottom right, click Compose icon.
Step 2: Click Attach icon.
Step 3: Next to Google Drive, click Show More and click the file you want to attach.
Step 4: When your message is ready, click Send.
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