This article explains how to create a dynamic image using custom data.
It looks a little complicated and that's because we're using formulas but it's actually quite straight forward once you understand the concept.

Step 1 is to add an image but click "Use formula"

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Step 2 enter your formula!  For custom data, use the format
|partition.custom_data["the_index"]|
Replace "the_index" with your index in the custom data table and remember to write the index in quotes. This is very important! If you don't use the quotes then Conducttr will look for a variable of that name.
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Step 3 update the custom data table
After step 1 & 2 you have a dynamic image but you need to update the custom data table with the index and the image link

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Step 4 add the dynamic image to your content
The image won't be displayed in the Scenario Editor because it's a formula.

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When the content is published, Conducttr will look up the index ("my_image" in this example), find the image URL and use that to display the image.

The benefit of using dynamic images is, if you have a training audience uploading and publishing photos, you can copy-paste an image link from the live exercise into the custom data table via the Facilitator Dashboard and then this can be echoed or referenced by the scripted MEL or Pattern of Life.

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