How to rotate and merge mp4 videos with ffmpeg?

I have two videos test.mp4 and test2.mp4, can i rotate video's then merge with one ffmpeg command ?

I can do that separate

For example I rotate videos wirh this command

ffmpeg -i test.mp4 -filter_complex transpose=1 test_rotate.mp4

And merge with this command

ffmpeg -f concat -i c:/ffmpeg/merge.txt -codec copy output.mp4

But when I want to use them together it says "Filtering and streamcopy cannot be used together"