waveline

Messaging

MMS and Media

Use media attachments when a text conversation needs images, documents, screenshots, or other context that is easier to show than describe.

Before you begin

  • Use an inbox number that supports messaging.
  • Confirm the recipient has consented to receive messages from your business.
  • Keep files relevant and professional.

Where to find it

Open a conversation in Messages and use the attachment control in the message composer. Mobile also supports picking media or documents from the device.

Step-by-step

  1. Open the conversation or start a new message.
  2. Choose the attachment option in the composer.
  3. Select the image, media file, or document supported by the app.
  4. Wait for the preview or upload state to finish.
  5. Add message text that explains the attachment.
  6. Send the message and check the thread for delivery or upload errors.

What happens next

  • Attachments are sent through the messaging provider and may be subject to carrier size and content rules.
  • Large files can take longer to upload and deliver.
  • Unsupported file types may be rejected before sending.

Best practices

  • Send the smallest useful file rather than a very large original.
  • Avoid confidential attachments unless your business policy allows texting that information.
  • Add plain-language context so the recipient knows why the file was sent.

Troubleshooting

  • If upload fails, try a smaller file or a common image/document format.
  • If the recipient does not receive media, try a text-only follow-up and review registration status.
  • If the composer freezes, reopen the conversation and retry the attachment.
Next
Opt-out and compliance