1) please download nightly from simple-xoops (rev. 189), I fixed a bug I found
2) Import tool works as following: a) adding the email to subscriber list (table xo_mod_xnewsletter_subscr) b) subscribe this new email to the selected newsletter cat (table xo_mod_xnewsletter_catsubscr) it seems that you have no newsletter cat in the video in the dropdown in column "Newsletter Name" you see "no Import" therefore no Import will be done
please create a newsletter cat first and try again