The crux of the problem: those pair of files with the .csv extension that I have have mime-type application/vnd.ms-excel . Substituting this value into the accept attribute of the input tag, the browser shows only files with the xls extension. Well, I need files with the extension csv . What value must be specified in accept in order to display .csv files for selection? Google did not help.
<input type="file" accept="application/vnd.ms-excel"> 