Need help on Apache configuration for redirecting URLS

I am extremely new to Apache httpd configuration. Can you please help here below is my requirement.

If the URL match existing resource - return resource.
If the URL doesn't match existing resource it should return index.html from the app root directory.
Apps root directories are:

1. /rcenter/custom/aws/apps/dashboard/
2. /rcenter/custom/aws/apps/analytics/
3. /rcenter/custom/aws/apps/docs/

(Basically each directory directly after /rcenter/custom/aws/apps/)

I tried to do in this way but this is not helping here.

RewriteRule ^/rcenter/custom/aws/apps/(.*)/$ 
> https://%{SERVER_NAME}/rcenter/custom/aws/apps/$1/index.html [P]