Specifying filepath for jenkins image gallery plugin

Question

I am trying to get https://wiki.jenkins-ci.org/display/JENKINS/Image+Gallery+Plugin to work. However, every single attempt to get it to work just tells me:

Creating image galleries.
Creating archived images gallery.
This build has no artifacts. 
Skipping image gallery in this build.

The documentation is sparse and the 3 types of image galleries available:

Archived images gallery, In folder comparative archived images gallery and Multiple folder comparative archived images gallery

make no sense to me.

The only thing I can make heads or tails of are the arguments: one requires an "include pattern", another requires a "base root dir".

According to the plugin,

You can use wildcards like 'module/dist/*/.zip'. See the includes attribute of Ant fileset for the exact format. The base directory is the workspace. You can only archive files that are located in your workspace.

Which links to http://ant.apache.org/manual/Types/fileset.html

I am storing my screenshots at /workspace/selenium/screenshots/a_screenshot.png,

but the following don't work:

Include pattern:

**/*.png
*.png
selenium/screenshots/*.png

Base root dir:

selenium/screenshots
/selenium/screenshots
/selenium/screenshots/*.png
/selenium/screenshots/*.png

And I've run out of ideas to try. Has anyone used this plugin successfully before, and how?

Answer 1

Being unfamiliar with Jenkins terminology, I was unaware that "archived images" actually required me to "archive the artifacts" in the first place!

Adding another post-build step to archive the screenshots made them available for the image gallery.