I have been trying to make an expression to pingpong loop the path property by giving back-and-forth prompts to ChatGPT I ended up with these solutions. None of them work perfectly there
How to Use the Loop Expression in After Effects
After Effects Video Tutorial: Looping Expression - The Beat: A Blog by PremiumBeat
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Using the Loop Expression in Adobe After Effects
Solved: Try loopOut("pingpong") You don't need to set th... - Adobe Support Community - 11131789
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After Effects Tutorial - loopOut("pingpong") Expression - YouTube
Using the Loop Expression in Adobe After Effects
Get Familiar with loopOut Expressions in After Effects
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loopOut Expressions Explained: A Journey in After Effects
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Using the Loop Expression in After Effects
Loop Out Ping pong Loop Animation in Adobe After Effects | After Effects Tutorial - YouTube
5 After Effects Expressions That'll Make You a Hero
5 After Effects Expressions That'll Make You a Hero
After Effects: How To Add the loopOut (“pingpong”) Expression - YouTube
How to Create a Perfect Ping Pong Loop in After Effects | Martin Muerza | Skillshare
After Effects Video Tutorial: Looping Expression - The Beat: A Blog by PremiumBeat