diff --git a/R/run_app.R b/R/run_app.R
index c40388fc3..9bc6068e0 100644
--- a/R/run_app.R
+++ b/R/run_app.R
@@ -50,10 +50,12 @@
 #'   run_app(settings = "/path/to/settings.yaml", settings_version = "NCA draft")
 #' }
 #' @export
+
+max_upload_size_mb <- 30
 run_app <- function(datapath = NULL, settings = NULL,
                     settings_version = 1L, ...) {
   # Increase max upload size to 30 MB
-  options(shiny.maxRequestSize = 30 * 1024^2)
+  options(shiny.maxRequestSize = max_upload_size_mb * 1024^2)
   if (!is.null(datapath)) {
     stopifnot(
       "Data file does not exist" = file.exists(datapath),
diff --git a/inst/shiny/modules/tab_data/data_upload.R b/inst/shiny/modules/tab_data/data_upload.R
index a10a0a69d..fe4bfd28d 100644
--- a/inst/shiny/modules/tab_data/data_upload.R
+++ b/inst/shiny/modules/tab_data/data_upload.R
@@ -15,7 +15,10 @@ data_upload_ui <- function(id) {
     div(
       class = "upload-container",
       id = ns("upload_container"),
-      p("Upload your PK dataset and Settings file (optional)."),
+      p("Upload your PK dataset and Settings file (optional).",
+        tags$br(),
+        tags$small(style = "color: #6c757d; display: block; margin-top: 4px;",
+                   sprintf("Maximum upload size: %s MB", max_upload_size_mb))),
       fileInput(
         ns("data_upload"),
         width = "50%",