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Troubleshooting Custom Values in MMS Workflows
Learn how to attach MMS URLs using Custom Values, stay within carrier size limits, and fix broken or invalid MMS attachments in BizStackPro workflows.
Making MMS Workflow Attachments Deliver Correctly Instead of Failing Silently
MMS workflows can fail unexpectedly when attachment links are invalid, files are too large for carriers, or unsupported media formats are used inside automated messages.
BizStackPro allows Custom Values to dynamically insert MMS attachment URLs into SMS and MMS workflow actions so the same media can be reused across campaigns and automations.
Without proper file formatting and carrier-compatible media settings, MMS messages may deliver without attachments, fail completely, or display broken media links for recipients.
This guide explains how to configure MMS attachment Custom Values, validate direct media URLs, stay within carrier size limits, and troubleshoot broken MMS workflow attachments inside BizStackPro.
Before troubleshooting MMS delivery failures, it helps to understand how Custom Values, direct media URLs, carrier attachment limits, and supported file formats work together inside BizStackPro workflows.
Overview
Custom Values let you insert a media URL dynamically into a Send SMS/MMS action so the same workflow can reuse the same attachment across campaigns or locations.
If the attachment fails, it’s usually due to one of these issues: invalid URL formatting (spaces/typos), unsupported file type, or carrier MMS size limits.
Quick tip: Always test the URL by pasting it directly in a browser first. If it doesn’t load instantly, it won’t work reliably as an MMS attachment.
Source Document: Troubleshooting Custom Values in MMS Workflows.
Attach a Custom Value URL to an SMS/MMS Step
Step 1: Create the Custom Value
- Go to Settings → Custom Values.
- Click + Add Custom Value.
- Paste the full MMS file URL into the value field.
- Name it clearly (example: promo_mms_image_url).
- Save.
Step 2: Insert the Custom Value in the Workflow
- Open your workflow.
- Add or edit a Send SMS/MMS action.
- In the MMS attachment field, insert your Custom Value (picker or token).
- Save the step and run a test to confirm the attachment renders.
Common mistake: Using a page URL instead of a direct media file URL. For best results, the URL should point directly to the image file (for example, ending in .jpg, .png, or .gif).
Carrier MMS Size Limits
Carriers may block MMS attachments that exceed their maximum allowed size. If your workflow “sends” but the recipient sees a broken attachment (or nothing at all), reduce the file size and try again.
- AT&T: ~0.6 MB
- Sprint: ~1.4 MB
- T-Mobile: ~1.5 MB
- Verizon: ~0.675 MB
Best practice: Target under 0.6 MB to stay compatible with the strictest limits.
Supported MMS File Types
For image-based MMS, use:
- JPEG
- PNG
- GIF
Tip: If you’re unsure what format your file is, check the file extension and confirm it downloads and opens normally on mobile.
Troubleshoot a Broken Custom Value MMS Attachment
1) Validate the URL
- Remove any spaces or hidden characters.
- Paste the URL into a browser and confirm it loads immediately.
- Confirm it’s a direct file link, not a page that contains the image.
2) Check size limits
- Verify the file size in your file manager or editor.
- Compress/resize the image to stay under the strictest carrier limit.
- Update the Custom Value if the file URL changes after re-upload.
3) Re-upload if the file is corrupted
- Re-upload the image to your hosting/storage location.
- Copy the new direct URL and update the Custom Value.
- Run a test send to confirm delivery.
If it still fails: Try a smaller test image under 200 KB. If that delivers, the issue is almost certainly file size or format on your original asset.
Send MMS reliably (without carrier failures)
Keep your attachments small, use supported formats, and validate your Custom Value URL before launching a workflow.
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Frequently Asked Questions
How do I attach a Custom Value MMS URL in a workflow?
Create a Custom Value that contains the full media URL, then insert that Custom Value into the MMS attachment field inside the workflow’s Send SMS/MMS action.
What are the maximum MMS size limits by carrier?
Approximate limits: AT&T 0.6 MB, Sprint 1.4 MB, T-Mobile 1.5 MB, Verizon 0.675 MB. If you exceed the limit, delivery may fail or the attachment may be stripped.
What file types are supported for MMS?
For images, use JPEG, PNG, or GIF for the best compatibility.
Why is my Custom Value MMS attachment not working?
Check for URL spaces/typos, confirm the link is a direct media file URL, verify file size is under carrier limits, and re-upload the asset if it may be corrupted.
How can I confirm my MMS file meets carrier limits?
Check the file size before using it in a workflow. If needed, compress or resize the image and update the Custom Value with the new URL.
Keep MMS attachments fast, light, and deliverable
When your Custom Value points to a valid file URL (and that file is within carrier limits), MMS sends are far more consistent across AT&T, Verizon, T-Mobile, and other networks.
Fewer failures. Cleaner workflows.
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