Add media in custom property in piranha CMS

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CMS

I am new in Piranha CMS and now i want to create custom property for post type as Media which upload a file.

I add new property in post type but when i add in content it display only textbox but want to be media from which i can upload an image.

so, help me in this.

Thanks

What I have tried:

I add new property in post type but when i add in content it display only textbox but want to be media from which i can upload an image.