How to send personalized image through Master Sending Account

Quick question about the master sending account setup with Nifty Images. How exactly do you get the personalized image to send as MMS through the master account?

Specifically:

What do you put in the sub-account webhook custom data fields for the image?
What goes in the master account SMS step for the image/attachment field?
Do you use a contact custom field, a custom value, or something else to pass the image URL across?

Been stuck on this for a while — the image sends as blank or invalid URL. Thanks!

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