Documentation for select_one_from_file

Hi there,

I couldn’t find a proper documentation on how to implement choices with select_one_from_file or select_one_external.

I’ve read a lot of posts in this very community forum, about the select_one_from_file feature.
Some of those post are fairly recent, so before trying anything, I upgraded our server to last version (kobo-install 2.020.25).
Screenshot_2020-06-30 Select one from file KoboToolbox(2)

What I can read everywhere is that feature should works in Enketo.
At the begining of May, I saw many entries saying it’s even working on ODK android’s app (great news, we need that!).

Many posts are referring to the same article: Select one or many from external file question type… which is a broken link giving 404 error.

I found few “all set” forms, like select_one_from_file.xlsx with fruits.csv.
Or EXAMPLE - Selects with Choice Filter Search with from_file.xlsx with id_names.csv.
But I couldn’t make those examples works on our KoboToolbox server.

No problem when uploading the XSLX forms, but it’s not working:


And form editing:

I have absolutely no clue on how to upload the associated CSV files.
I’m not sure if it’s related, but on the official documentation about the pulldata feature, they say: " upload your CSV the same way you would upload your images".
What does this means?

Well, I’m totally puzzled about that feature, if anyone can share some light here, I would greatly appreciate.