Hello,
I have noticed your project and decided to join! I'll go straight to the point - I have similar experience, and I have built a telemedicine app to connect patients and doctors. It was created to an insurance company, and allows to upload photos as well documents, provides chat (with video) and has payment integration.
In other words, I am sure that I can built same app for you as well. Finally, I work with medical informatics since 2015 and have experience not only in tech, but in domain design as well.
If you have any questions or specific requirements, feel free to contact me!
See you soon.