[FFmpeg-user] Merging apad and overlay filters in complex filter

[C Colutions]

Hi.

I was trying to attach audio to a video which adding an overlay image to
it. Im using the following command:

[/data/user/0/com.photovideomaker.videoslideshowmaker.videoeditor/files/ffmpeg,
-y, -r, 11.0, -f, image2, -i,
/storage/emulated/0/TestDirectory/TempImages/img%03d.jpg, -i,
/storage/emulated/0/TestDirectory/introSound.mp3, -i,
/storage/emulated/0/TestDirectory/TempImagesNatural.png, -filter_complex,
[audio]apad[audio];overlay=0:0, -shortest, -crf, 20, -map, [audio], -c:v,
libx264, -preset, ultrafast, -pix_fmt, yuv420p, -ac, 2,
/storage/emulated/0/TestDirectory/finalOutPut.mp4]

but its not working. Im getting the error

Output with label 'audio' does not exist in any defined filter graph, or
was already used.

Thank you for the help.