'How to customize "Attach" button action on "Email Activity" Screen(CR306015) in Acumatica

I need to customize a "Attach" button on Email activity screen, which brings the files which i have attached in my main screen. For example "I need a customization which is same as "Drawing Log" concept.

I have created the customized screen called "Report Log" in this screen user will attach the files. Also I have customized a "Send email" button, once it is clicked it will redirect to "email Activity" screen. So far it is ok.

In email Activity screen i need a customized "Attach" button smart panel which should list out files which i have attached in my report Log screen. Please help me on this.

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