I am exploring how to create a "Supplier Portal" where they can upload their billing files and have them concentrated in one place.

Billing files are .pdf and .xml files

I don´t know how to configure these extensions to upload, the upload question only accepts png, gif, doc, odt

Thanks in advance

There is an "Allowed file types" setting for the upload question. You can add those file types there.

Thanks Tony, it was very easy but I did´t see the option

Thanks for your help