Tablet android app Mods

I WILL CONSIDER ONLY PEOPLE WHO READ PROJECT DESCRIPTION. THE BUDGET RANGE WILL NOT CHANGE SO IF YOU ARE PLANNING TO PASS THE BUDGET RANGE THEN DONT BID. i have an android tablet app for showcase real estate projects. Is showing videos, pictures, and apartment floor plans. On floor plans when is clicked a kitchen, room, etc is linking a virtual 360 tour from kuula page. EXAMPLE --> [login to view URL] The only problem with this method is i need internet connection. I NEED A SOLUTION TO DISPLAY VIRTUAL TOURS WITHOUT INTERNET CONNECTION The possible options to achieve this are: 1. use unity to create 360 image player. The existing source code of the project includes the code for this on unity however exist a distortion on visualization which previous developer was not able to fix 2. create the 360 visualization with any other tool like [login to view URL] [login to view URL] or with any other way you have in mind. 3. create intent function on android to open the 360 image with another app which be able to show the 360 virtual tour. i dont care which option is used.. i just need be able to see the panoramic image offline. Additionallly to this i need this task [login to view URL] the png icons which trigger the link. 2. i would like to add some images and videos to the galleries or floor plans already exist. No coding required, just add content. 3. update google map api keys (i want this api be created with my gmail account) 4. right now the app is using png images... i would like the possibility to use jpg or webp images in order to reduce app size. 5. exist a section called AVAILABILITY in which is uploaded an image from gallery and is saved and may be displayed on the app. However when app is closed this image is lost. i would like the image always appear no matter if app was closed.