Very basic Blocks question

Yes, the file-block is intended to hold only a single file. Take a look in the documentation to that block: https://www.ads-software.com/support/article/file-block/

There is an alternative if you want to create a list of download files: https://www.ads-software.com/plugins/download-list-block-with-icons/

Thanks so much for the clarification. No wonder I had so much difficulty!
I was trying to add groups of associated files to the same block rather than one file per block.

Don’t know how I missed that basic point!

I looked at the link you provided. Unfortunately the video wasn’t working but you were very clear in your answer.
Thanks again for taking the time to reply.