FFMPEG overlay by time not working in my case

Add -loop 1 before each JPG:

ffmpeg -y -i love.mp4 -i .\1080.png -loop 1 -i .\021.jpg -loop 1 -i .\022.jpg -loop 1 -i .\023.jpg -loop 1 -i .\020.jpg -filter_complex " [2:v]scale=534:810[a]; [3:v]scale=534:810[b]; [4:v]scale=534:810[c]; [5:v]scale=8000:4000,zoompan=z='min(zoom+0.0020,1.5)':d=417:s=1080x2340,setsar=1[d]; [0:v]scale=1080x2340,setdar=1080:2340,colorkey=0x1CD51A:0.3:0.2[ckout]; [1:v][a] overlay=10:8:enable='between(t,0,8)'[o1]; [o1][b] overlay=264:778:enable='between(t,1,8)'[o2]; [o2][c]overlay=534:1524:enable='between(t,2,8)'[o3]; [d][o3]overlay[o4]; [o4][ckout]overlay[o5]" -map "[o5]" -pix_fmt yuvj422p -t 8 outvideoOverlayInImage.mp4