Hello Saykor,
For the field to be updated as a picture, you need to make sure its ImageUri property is set to the image path. For example, here is how to insert an InclduePictureField at the current caret position:
Alternatively, you can use a merge field like in the example. For example you can subscribe to the CommandExecuting event of the control and check if the field that is being inserted should contain a photo.
Regards,
Petya
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