Can you please suggest what is the maximum advisable size limit for the output PDF in Output service, also what's the maximum size limit of an email attachment?

Currently have our application in AEM Forms 6.1 and we have a dependent java based application which currently runs on java 7, after upgrading AEM Forms only to 6.5, will it still support the application through REST based http/s POST call? Appreciate your help! 

HI ,We are facing issue, the css is not loading in the higher environments and we are getting the message as below. But in the local instance it is working.Any help on " MIME type ('application/octet-stream') is not a supported stylesheet MIME type, and strict MIME checking is enabled." will be high...