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You can attach files — images, documents, and other media — to both SMS and email messages in Hoop Conversations. Understanding size limits for each channel ensures your attachments are delivered successfully.

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Attaching files in conversations

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SMS / MMS attachments

1

Open the SMS channel

Open a conversation and select the SMS tab.
2

Click the paperclip icon

Click the paperclip icon in the message toolbar to attach files.
3

Choose your upload method

Select from your computer, media library, or by URL, then add your file.
4

Send

Click Send to deliver the message with the attachment.

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Email attachments

1

Open the email channel

Open a conversation and select the Email tab.
2

Click the paperclip icon

Click the paperclip icon at the bottom of the email composer.
3

Upload your file

Choose a file from your computer or media library.
4

Send

Compose your message and click Send.

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SMS attachment size limits

LimitValue
Maximum attachments per message10
Maximum total size (text + attachments)5 MB
Recommended size for best deliveryUnder 500 KB
Toll-free number limit600 KB or smaller
Supported file types for SMS: JPEG, PNG, GIF
  • Verify MMS capability — check your account settings under Phone Numbers to confirm your number supports MMS.
  • Reduce file size — if a message fails, try compressing the attachment or using a lower-resolution image.
  • Check file type — only JPEG, PNG, and GIF are supported for SMS attachments.
  • Toll-free numbers — keep attachments at 600 KB or smaller due to carrier restrictions.
MP4 files cannot be sent directly via SMS. However, recording a video in the mobile app generates a clickable link instead. Ensure the link matches your domain and client’s brand name for carrier compliance.

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Email attachment size limits

LimitValue
Maximum email size (body + attachments)25 MB (Mailgun)
RecommendedKeep as small as possible
Email servers impose size limits to prevent overload. Exceeding the limit results in bounced emails. Different email providers have different limits — Mailgun supports up to 25 MB total.
  • Compress files — use tools to reduce attachment size before uploading.
  • Use lower-resolution images — high-resolution photos are often much larger than necessary for email.
  • Cloud links instead — for very large files, upload to a cloud service (Google Drive, Dropbox) and include a download link in your email body.
  • Error notification — if an email bounces due to size, you will see an error notification in the Conversations tab indicating the attachment exceeded the allowable limit.
No. Size limits are enforced by email servers and cannot be bypassed. The recommended workaround is to upload the file to a cloud storage service and share a download link in the email instead.
Last modified on March 4, 2026