如何使用Jinja和Flask从我的图像文件夹动态渲染图像？

I am using Flask to learn Python and to create a toy application that I've wanted to make for awhile. I'm having problems with a particular feature which is the standard file uploading. What I want to do is to try to dynamically render an image from my images folder based on a particular model but I seem to be having a problem trying to string interpolate.I am using Flask to learn Python and to create