How can I only accept and show in the search csv files using dcc upload?

I have a dcc Upload element and I saw there is an accept variable But I cannot figure out how can I use it to only accept CSV files and in the search to only show me CSV files.
Anyone got an idea of how I can do this?

This works for me by showing only .csv & .xlsx files,

dcc.Upload(id = "file-upload", 
           accept = ".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,

I Hope this helps

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Yes it does! Thanks!