FileDropper accepted_filetypes doesn't seem to properly validate

[ahuang11]

import panel as pn

pn.extension()

self._file_input = pn.widgets.FileDropper(
    multiple=True,
    accepted_filetypes=[".csv", ".parquet", ".parq", ".json", ".xlsx"],
)

[hoxbro]

What happens if you pass in without the dots? E.g. csv instead of .csv.

[ahuang11]

Still fails

import panel as pn

pn.extension()

pn.widgets.FileDropper(
    multiple=True,
    accepted_filetypes=["csv", "parquet", "parq", "json", "xlsx"],
).show()

[philippjfr]

Seems like a problem with Filepond itself: pqina/filepond-plugin-file-validate-type#13

Problem is that it passes the accept keyword down to the DOM node, which does support file extensions but the FilePond validation logic itself expects mime types.

[CyberQin]

This problem is still exists when v1.5.0 published.

[MarcSkovMadsen]

To solve this problem for our users we could convert know file suffixes to mime types.