Ideogram Remix - How to input variable as URL

I’m not sure if that’s what’s causing the problem but I’m getting the following error:

Error: Ideogram::

Ideogram V2-remix: There was an error processing your message

Run Failed: Execution error

I’m trying to build the start frame and end frame for the video generation block. I also need to know how to input url as variable there too.

Right now I’m testing with variables in the prompt. But can’t get past the Ideogram Remix error while creating the end frame.