If selected field in dataform.

If I put in ##export## for each entry the button appears. If I will export one record I have the error message.

##multiexport:icon## in the Header row works with the newest git version.

"You tried to repeat the export of some information, or start an empty export. To do that properly you should go back to the original location and start again. This sometimes happens if you use the back button after an export has completed, or by bookmarking an invalid url."

portfolio export is enabled. And set portfolio: File Download

See also discussion

https://moodle.org/mod/forum/discuss.php?d=216886&parent=967192

I expect: It must have something to do with between dataform and the portfolio function.