Thank you @MartinDDDD and @takbb,
the concerns above has been solved through the Validate excel file node.
However, as I further explore to read the good files into one data, I face some difficulty as I am only able to read each file address at a time and new one keep replacing the old one when I put them in loop.
but allow me to move this to different topic as I already recieve help and got solution to this topic.
Really appreciate your both advice