Click the Send Anywhere icon at the bottom right of the Compose window in your Outlook 365 account.

Click on the file attachment area to select the file to attach or drag and drop the file to attach.

When the attached file is uploaded to the Send Anywhere server, a file download link is inserted into the message automatically.

Attached files can be downloaded for a week without any limit. The detailed download period can be checked under the download link. If you click on a link with a download period remaining in the attached file list, you can insert the link again in the message.

* You can upload files up to 10GB at a time. There is no limit to the number of files you can upload.