https://support.microsoft.com/en-us/office/reduce-attachment-size-to-send-large-files-with-outlook-8c698842-b462-4a4c-8d53-5c5dd04f77ef?ui=en-us&rs=en-us&ad=us
Send large files by using file sharing, cloud services, or other solutions for working around file size limits in Outlook.
send large filesreduceattachmentsizeoutlook