Hi @sreekalyani,
I'm no Dispatcher expert but I think the issue is with your glob expression.
If we take the two paths you provided:
/content/dam/react_aem_spa/hiking_4.jpg
/content/dam/react_aem_spa/hiking_4.jpg/jcr:content/renditions/cq5dam.thumbnail.140.100.png
The following glob only matches the first asset:
/content/dam/react_aem_spa/*.*
Instead I think you should be using this glob which matches both assets:
/content/dam/react_aem_spa/**
I'm a regex man and I've always disliked globs, which is why I use https://globster.xyz/ to double-check my globs 😉 Have a look!
Matches one:

Matches all:
