How to out to a text file from within a FOR loop, batch file

[JN-]

This is a sample of attempt but it doesn't output to the text file using >>, instead it simply display on screen the counter no. + Temp.txt as if it were one of the *.* files being processed.

SET /A _COUNTER=0
for %%f in (*.*) do (
SET /A "_COUNTER+=1"
echo [!_COUNTER!] %%f
echo [!_COUNTER!] %%f>>Temp.txt

REM ffmpeg processing is done here ...
)

Apologies, it works OK I simply overlooked something else. Mod can delete if need to.