Android app + Offline Chat + Photo Upload reminder

We are hair transplant clinic. We want to have an app for our clients who have already done the surgery also for them who want to get a free consultation. Idea behind it: To engage the client with the clinic for at least one year or more. Once the surgery has done, the clinic need to check the progress of the hair growth till one year, and in between he can ask any questions to the clinic, which we will clarify. The client will get notification to upload his photo in frequent weeks.