Attempting to preview and save a video made in a for loop will only work in the first iteration

[JasonS09]

I have this huge workflow where I attempted to iteratively add images to a batch that would be then combined within the for loop. As the generation takes long (I'm targeting to generate a 5 minutes video), I was trying to save progress every set number of iterations. I feel disappointed now that I can only preview and save the results of the first iteration. I'd like to know if this is intended?

[DrJKL]

Do you have a minimal example?
I think if you accumulate the filename output from the node it should be expanded.