unable to upload a file when running locally

[VladimirVinarsky]

The locally run application (open the server.R function in expression folder) is not able to upload data file without reporting any error.
However it still reads the example data.
Am I doing something wrong?
Thank you for response
Best Vladimir

see the sessioninfo below if it helps:

R version 4.3.1 (2023-06-16 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19045)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.utf8 LC_CTYPE=English_United States.utf8
[3] LC_MONETARY=English_United States.utf8 LC_NUMERIC=C
[5] LC_TIME=English_United States.utf8

time zone: Europe/Budapest
tzcode source: internal

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] ape_5.7-1 RColorBrewer_1.1-3 ggdendro_0.1.23 gplots_3.1.3 gdata_2.19.0
[6] d3heatmap_0.9.0 shinyBS_0.61.1 spin_1.0 jscolourR_0.0.0.9000 shiny_1.7.5

loaded via a namespace (and not attached):
[1] sass_0.4.7 utf8_1.2.3 generics_0.1.3 bitops_1.0-7
[5] KernSmooth_2.23-21 gtools_3.9.4 lattice_0.21-8 digest_0.6.32
[9] magrittr_2.0.3 caTools_1.18.2 grid_4.3.1 fastmap_1.1.1
[13] jsonlite_1.8.7 promises_1.2.1 fansi_1.0.4 scales_1.2.1
[17] textshaping_0.3.6 jquerylib_0.1.4 cli_3.6.1 rlang_1.1.1
[21] ellipsis_0.3.2 munsell_0.5.0 base64enc_0.1-3 withr_2.5.0
[25] cachem_1.0.8 yaml_2.3.7 parallel_4.3.1 tools_4.3.1
[29] memoise_2.0.1 dplyr_1.1.2 colorspace_2.1-0 ggplot2_3.4.3
[33] httpuv_1.6.11 vctrs_0.6.3 R6_2.5.1 mime_0.12
[37] png_0.1-8 lifecycle_1.0.3 htmlwidgets_1.6.2.9000 MASS_7.3-60
[41] ragg_1.2.5 fontawesome_0.5.2 pkgconfig_2.0.3 bslib_0.5.1
[45] pillar_1.9.0 later_1.3.1 gtable_0.3.4 glue_1.6.2
[49] Rcpp_1.0.10 systemfonts_1.0.4 tibble_3.2.1 tidyselect_1.2.0
[53] rstudioapi_0.15.0 xtable_1.8-4 nlme_3.1-162 htmltools_0.5.6
[57] compiler_4.3.1