For example, I am building a website which offers local graphic design to clients. However, the actual portal for submission of work, review of work, comments, notes, etc. is difficult to build. Does anyone know if there is software/plugins available which can be integrated into the website?
The only other option is communication through email but this isn't professional.
For the design sharing and feedback part, my previous company used https://www.invisionapp.com. There's several other services in this space you can find.