your blocks look fine...
which response do you get in the FileTools.FileCopied event?
is the file really there in the ASD where you expect it?
it will bring heavy restrictrions on how to access files in future...
see also @ewpatton's bog here, which has been published 1 year ago
https://appinventor.mit.edu/blogs/evan/2020/08/08/file-path-updates-android-10
which means in your case, probably without using an extension (which still has to be written) it then is not possible anymore to access a file in the /Download folder if your app did not create it, see also the discussion here Testing the next release of MIT App Inventor (nb187) - #187 by Taifun
Taifun