Quick Answer
How do you attach a file to an Email or SMS message?
Open Conversations, select the contact, then either drag the file directly into the message composer or click the paperclip icon and select a file. Confirm that you are using the correct channel, review the recipient and attachment, then send the message.
How Attachments Work in Conversations
Documents, screenshots, images, and other files often need to be shared while you are already communicating with a contact.
Attachments let you send those files directly from the Conversations workspace instead of moving between separate tools.
You can add a file by dragging it into the composer or by using the paperclip attachment control.
Email and SMS/MMS have different attachment behavior and limits, so it is important to confirm the channel before sending.
Explain important attachments in the message
The source guide recommends telling the contact what the attachment is, especially for time-sensitive files such as an invoice, document, or form.
Attachments at a Glance
Before You Begin
Check the channel, file size, and recipient before attaching the file.
- Open the correct contact conversation.
- Confirm whether you are sending by Email or SMS/MMS.
- Make sure MMS is enabled before sending an SMS attachment.
- Check the combined size of SMS/MMS text and attachments.
- Keep SMS/MMS attachments below the 5 MB total limit.
- Keep the number of SMS/MMS attachments at 10 or fewer.
- Compress large images or videos when needed.
- Tell the contact what an important attachment contains before sending.
Step-by-Step: Attach and Send a File
Add the file from the conversation composer, review the channel and recipient, then send it.
Open Conversations
Go to the Conversations area in BizStackPro.
Select the Contact
Open the contact conversation where you want to send the attachment.
Drag and Drop the File
Drag the file directly into the message composer area.
Or Use the Paperclip
Click the paperclip attachment icon and select the file you want to send.
The source page also notes that the Media Library may be available when selecting files.
Review the Channel
Confirm whether the message is being sent by Email or SMS/MMS.
Verify the Recipient
Check the contact information and make sure the attachment is going to the intended recipient.
Send the Message
Review the attachment and message text, then click Send.
Give the attachment context
Add a short explanation such as “I’ve attached the invoice” or “Here is the form we discussed” so the contact knows why the file was included.
SMS and MMS Attachment Limits
SMS attachments use MMS and are subject to stricter size and quantity limits than ordinary Email attachments.
MMS Must Be Enabled
The source guide states that MMS must be enabled to send attachments through SMS.
Keep the Total Under 5 MB
The combined size of the message text and all attachments must remain below 5 MB.
Up to 10 Attachments
You can send up to 10 attachments in one SMS/MMS message as long as the combined size stays under the limit.
Toll-Free MMS
The source guide states that Toll-Free numbers support MMS attachments, commonly up to 5 MB, depending on the carrier.
Compress larger media before sending
The source recommends compressing images and keeping videos short for SMS/MMS to reduce carrier rejection and slow delivery.
Email Attachments and Media Library Behavior
Large Email Files
The source page notes that larger Email files—often around 20–25 MB or more—may be stored and linked through the Media Library rather than attached directly.
Media Library Video Uploads
When a video is uploaded through the Media Library for Email, BizStackPro can generate a clickable GIF thumbnail.
Clickable Video Preview
The GIF thumbnail can appear inside the Email and link to the hosted video.
Media Library Links
Using the Media Library for larger files can reduce the need for separate external file hosting and help avoid attachment size problems.
Attachment Best Practices
Frequently Asked Questions
How can I attach a file to an email or SMS message?
What is the maximum file size I can send via SMS?
Can I send multiple attachments in one SMS?
Do Toll-Free numbers support attachments via MMS?
What happens when I upload a video attachment in an email?
Continue Learning
Continue learning how Email, SMS, Media Library files, messaging rules, and other Conversations tools work together.
