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TIL: If your LearnR exercise tutorial has fill-in-the-blank exercises, you need to install a different version of packrat to get it to work on shinyapps.io: remotes::install_github("rstudio/packrat") #rstats #learnr
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This is documented here: rstudio.github.io/learnr/publishing.html#Security_Considerations But it should probably be in a more prominent place.