Add Functionality in Existing Android App

I want to add a functionality in Android App. This functionality is already available in the app but not working correctly. Here is the details:- 1. User can Upload multiple image using Camera or Phone Gallery. These Images has to be compressed before transfer to the server. 2. User will select file type (Drop Down Option) and Enter Date (Using Calendar) for each image before upload. and Both are mandatory fields. 3. Based on File type, Date, User ID , a file name will generate for each Image. For Example File type is jpeg, Date is 05-11-2018, and User ID is CL1234 then file name will be [login to view URL] . Here xxxx is some random string. 4. Simple but attractive UI is expected. 5. Need to write web service for uploading using PHP Script.