You’ll receive an error message if you attempt to attach files larger than the maximum size limit. There are a few ways to work around this size limit, including using a file sharing service or compressing the file.
Outlook limits the size of files you can send. This limit prevents your computer from continually trying to upload very large attachments that exceed the limits of most Internet service providers. For Internet email account. such as Outlook or Gmail, the combined file size limit is 20 megabytes (MB) and for Exchange accounts (business email), the default combined file size limit is 35MB.
Save your file to a cloud service and share a link
There are many cloud storage services to which you can upload and then share large files. Some popular cloud storage services include OneDrive, Dropbox, iCloud, and Google Drive. Once your file is stored in the cloud, you can include a link to the document in your email message.
Upload your file to a cloud service, such as OneDrive or Dropbox.
Note: The service you use generates a link to access your file. Your recipient can open the link to download your file.
After you upload the file, copy the link, and paste it into your email message.
Find your OneDrive Folder
Create a New folder
Copy the files you want to share into that folder
Go back up one level so you can see your new folder
Right Click on the new folder
When the new window appears,
check Anyone (you may want to use Specific People)
CheckAllow editing if you want the other people to make changes
Choose an Expiry dateThis will stop sharing and access on that day.