Multimedia Messaging Service (MMS) allows you to send media files, including images, audio, and video, in your messages.
It also allows you to send text messages up to 1,600 characters, including a title—that's far more than a traditional text message, which is limited to 160 characters.
If you'd like to send a file not as a link but as an attachment, use the Inbox option 'Embed media as MMS'. It's possible to upload maximum 15MB for GIF, JPEG, JPG/JPEG, PNG and 600KB for VCF, MP3, MP4, PDF and animated GIF.
Note: Additional carrier format limitations can be applied, depending on the number. There'll be an informer in case the selected format isn't supported.