Overview

This article explains the file size limits for attachments when sending text messages and emails through Enrollio. Understanding these limits helps you communicate effectively with families without running into delivery issues.

Why File Size Limits Matter

Knowing attachment limits helps you avoid failed deliveries and keeps your messages optimized for the best results when communicating with families.

  • Prevents delivery failures caused by files that are too large
  • Ensures compliance with carrier and email provider rules
  • Simplifies file handling using the built-in Media Library
  • Boosts engagement with interactive video thumbnails
  • Reduces the need to compress files or use external hosting

Text Message Attachment Limits

Text messages can only contain text. To include attachments like images, videos, or documents, you need to use MMS (picture messaging). When you attach a file to a text message in Enrollio, it's automatically converted to MMS.

Supported File Types

The following file types work reliably for MMS:

  • JPEG
  • PNG
  • GIF

Note: File types like MP3, MP4, and PDF may work depending on the recipient's carrier and device, but aren't guaranteed across all carriers.

Carrier File Size Limits

Best Practice: Keep MMS attachments under 500 KB to ensure successful delivery across all carriers.

[SCREENSHOT: Table showing carrier-specific file size limits]
Carrier Long Code MMS Size Toll-Free MMS Size Short Code MMS Size
AT&T 1.0 MB 0.6 MB 0.6 MB
T-Mobile 1.5 MB 0.6 MB 1.0 MB
Verizon 1.0 MB 0.6 MB 1.2 MB

Number Type Support

All phone number types in Enrollio support MMS attachments:

  • Long Code (10DLC): Yes — recommended max 500 KB to 1 MB
  • Short Code: Yes — up to 5 MB
  • Toll-Free: Yes (since October 2022) — up to 5 MB

Email Attachment Limits

Attachment limits for email depend on which email provider your recipients use. Exceeding these limits can cause emails to bounce or fail to deliver.

File Size Limits by Provider

The Enrollio email composer allows up to 20 MB in attachments. Files larger than this are automatically uploaded to your Media Library and sent as clickable links instead.

Email Provider Max Attachment Size
Gmail 25 MB
Yahoo Mail 25 MB
Outlook.com 10 MB
Mailgun 25 MB

How to Attach Files in Messages

Uploading files directly in your message composer is simple and flexible. Whether you're sending a text or email to a family, you can upload files from your device or choose from your Media Library.

[SCREENSHOT: Message composer showing the three-dot menu with attachment options]

Step 1: Access Attachment Options

Open a conversation and click the three-dot icon (•••) in the message composer.

Step 2: Choose Your File Source

Click "Attach Files" and choose one of two options:

  • Upload from System — select a file from your computer or device
  • Choose from Media Library — select a previously uploaded file
[SCREENSHOT: Attachment source selection dialog showing Upload from System and Media Library options]

Step 3: Automatic Handling for Large Files

If your file exceeds 20 MB (for email) or the carrier limit (for text messages), Enrollio automatically uploads it to your Media Library and inserts a clickable link into your message. This ensures delivery without hitting size limits.

Pro Tip: When you upload a video file through the Media Library, Enrollio automatically generates a GIF thumbnail that appears in your email, making your message more engaging and clickable.

Quick Method: Paste Attachments

You can attach files even faster by pasting them directly:

  1. Copy a supported file or image on your computer
  2. Click inside the message composer
  3. Press Ctrl + V (Windows) or Cmd + V (Mac), or right-click and select Paste

The file attaches instantly and follows the same size limits and handling rules.

[SCREENSHOT: Demonstration of paste functionality in message composer]

Sending Larger Files

When you need to send files larger than the standard limits:

  • Upload directly via the message composer — files over 20 MB are automatically hosted via Media Library and sent as links
  • Add videos via Media Library to generate interactive thumbnails
  • Use cloud hosting only if you need to share files outside of Enrollio

Frequently Asked Questions

What happens to files over 20 MB?

They're automatically uploaded to the Media Library and sent as clickable links to the family.

Can I upload attachments directly from my device?

Yes! You can choose between uploading from your computer or browsing your Media Library.

Can I attach videos to a text message?

Yes. Videos are sent as hosted links rather than embedded files to avoid delivery issues and size limits.

Do toll-free numbers support picture messages?

Yes! Since October 2022, toll-free numbers support MMS and attachments.

Will video attachments show a preview in emails?

Yes — GIF thumbnails are automatically generated for video files uploaded via Media Library, making your emails more engaging.

What file types work best for text messages?

JPEG, PNG, and GIF files work reliably across all carriers. Other file types like PDF, MP3, and MP4 may work but aren't guaranteed on all devices.