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It takes me to an online toolkit. I'm not sure how this solved my original problem. Do I start all over again building my material in this online toolkit? I thought this would allow me to upload photos and videos into my existing Xerte plugin. Still confused.

Sorry about the miscommunication. This is a complete new installation.

I can't offer much help on the WordPress plugin, because I don't know WordPress, and I don't have an installation.

You use this instead of the WordPress plugin. So whereas you'd click new post - now you click create instead. After that it is the same editor as you used before.

Using this software will not alter the WordPress install in anyway - it is an alternative.

Yes, you start again using this.