I have looked all over and could not find an example of someone using an R script on uploaded files in R Shiny and proceeding to download the new file/dataframe that resulted from that "transformation". I am not that familiar with R Shiny syntax and need to know how and where to place code that operates an R script on 2 uploaded datasets that will act as 2 dataframes that will be altered and changed in the R script and ultimately become one dataframe that I will want to download/export after the R script is finished. Any help is appreciated thanks.
The only question I saw that was similar to the one I have is "Can R Shiny be used to import file, run R script, and export file?" but the answer did not include an example of an R script being operated/performed on the uploaded dataset(s) and the download resulted in a .html file when I would like a .xlsx file.