I had a similar problem, and found that the documents did not convert very well and needed too much clean up as well as uploading media items separately.
There is a plugin called "odt2dw plugin" that converts Open Office or Libre Office *.ODT files into a dokuwiki format, including embedded images, which it uploads to your wiki and automatically inserts them in the converted wiki page.
https://www.dokuwiki.org/plugin:odt2dw
I got excellent results by converting the doc files via Libre Office into ODT files, then using the plugin to upload them to the wiki. There are some syntax errors that I need to fix, but I found the end result was much better than attempting word to dokuwiki conversions.