Okay, Thanks for your Reply 
I am building an app for a big seminar. The app contains registration (firebase), brochure, queries, feedback, receipt image and many screens till 14. I have my custom made side menu in my app. When a screen is opened from the menu screen, and when back is pressed on the screen opened, It gets to the previous screen opened and so on from the menu screen.
I saw that in stack navigator, this does not happen. Therefore, I want to use the Stack Navigator for Navigation. But I still cant figure how to do…
And can u please explain the firebase part more clearly to me?
And of spreadsheets, I am trying to save the screenshot of the receipt screen in the cloud. (the admin will save i the cloud and the user will get his / her respective receipt from the cloud. The Airtable Spreadsheet has Attachment field type for images and images are not being stored…can you provide a working snippet? or an idea?)
Thanks in advance