闪亮的应用运行代码生成pdf然后提供该pdf给用户下载

In my shiny app I want to be able to click a download button, have it execute a function I have (in a package) that creates a pdf in a /results folder, then offer that created file as a download to the shiny app user. I pasted my current download_portfolio download button code from the server below (so many pieces not sure how I can make it reproducible). Wanted to see if anyone has an idea of whats going wrong, I get the error message below, however the FUNCTION_TO_GENERATE_PDF_IN_/results() function does run and create the PDF but then the app reloads and the user never gets prompted for a download.In my shiny app I want to be able to click a do