Rmd file from library(rmdformats) doesnt keep formatting in Shiny app

Hi
I am working on a Shiny app and I want to include a Rmd file using code:

                         tabPanel("Key Findings", value = "kfind",
                                  fluidPage(
                                     
                                           
                                     includeMarkdown("keyfindings.Rmd"))

If I render rmarkdown file separately everything is fine with formatting. Once I run Shiny app text is shown but formatting is not saved.
How to repair this issue?
Thx