From the online course = [Records: Design and Build a View into Your Data -> configuring the record list]

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1. I am trying to insert an image using "Attach New File"

2. and then, bring the image to the grid, like the picture below

3. from the lesson : Configuring the Record List

at 4min 10sec 

the educator uses a CDT : vehicleImage

4. I wasn't able to know what the type of the vehicleImage is, and how the vehicleImage was made.

Also, how to put image data(the image that I attached using the "attach new file") into the vehicleImage. 

please help.