[Plugin: Insert or Embed Articulate Content into WordPress] -1 error while uploading .zip file

When I attempt to upload my Articulate course zip file I get a dialog box that displays “-1” and the file is not uploaded.

I’m using Articulate Presenter 5 Professional to produce the .zip file.

I appreciate any pointers to resolve this, the plug-in really looks great.

Thanks

https://www.ads-software.com/extend/plugins/insert-or-embed-articulate-content-into-wordpress/