I am trying to get this to work.  I want to use "palettegen" on the final out.

ffmpeg -i FF.MOV -filter_complex \
"[0:v]trim=4.8:7, crop=720:720:40:0, setpts=PTS-STARTPTS, setpts=.8*PTS, split [v1][reverseMe]; \
 [v1] palettegen [p]; \
 [reverseMe] reverse,setpts=PTS-STARTPTS, setpts=.8*PTS[reverseVideo]; \
 [v1][p] paletteuse [firstVid]; \
 [reverseVideo][p] paletteuse [secondVid]; \

 [firstVid][secondVid] concat=n=2:v=1[v] " -map "[v]" -loop 0  -y o7.gif

I receive this error instead.

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x556e0069ba80] Invalid stream specifier: v1.
    Last message repeated 1 times
Stream specifier 'v1' in filtergraph description [0:v]trim=4.8:7, crop=720:720:40:0, setpts=PTS-STARTPTS, setpts=.8*PTS, split [v1][reverseMe];  [v1] palettegen [p];  [reverseMe] reverse,setpts=PTS-STARTPTS, setpts=.8*PTS[reverseVideo];  [v1][p] paletteuse [firstVid];  [reverseVideo][p] paletteuse [secondVid];
 [firstVid][secondVid] concat=n=2:v=1[v]  matches no streams.