You could find more information about PictureBox item's data binding in our PictureBox: Data Binding
section of the help article.
As a side note, prior to version 18.104.22.1682 of Report Server, we have a bug with resolving the PictureBox image from relative and absolute path. Please refer to Progress® Telerik® Report Server R3 2018 (22.214.171.1242)
release history page for more information. AA possible workaround prior to this version is using a custom function that returns a System.Drawing.Bitmap
instance with the image instead of the path. In this case the path to the image will be resolved by the user function.
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