I used the block in Person’s profile page and it’s working. The block is already there by default and called- User Files.

For groups:

In Studio->Navigation-> Groups Submenu- you can activate the Files- and files posted in the group should be there in that submenu and that page has this block that you want- Files in context

*View Groups Submenu I mean

Thank you so much @Karina Budhrani for your prompt reply. I do have them in a submenu, but I wanted to have a block with the files of "each group" showing a list or cards (show or else) of all files in that group, that is why I added a block with "files in context" or "posted in" or "files categories" and all failed to show the files in that group.