What is a .THUMBDATA4--1967290299 file?
A .THUMBDATA4--1967290299 file is a special kind of data file that is made by the Gallery app on some Android phones, like the Sony Xperia and Samsung J7. This file helps the Gallery app work faster by keeping track of all the small preview pictures, called thumbnails, that the app has looked at and organized. These thumbnails are the tiny versions of your photos and videos that you see before opening them fully in the app.
The .THUMBDATA4--1967290299 file is kept in a secret folder on your phone named .THUMBNAILS. Normally, you can't see this folder because it's hidden. But, if you change your phone's settings to show hidden files and folders, you'll be able to find it.
To open or work with a .THUMBDATA4--1967290299 file, you don't need any special program other than the Gallery app that comes with your Android phone. This app automatically creates, uses, and manages the file without you needing to do anything. So, there's no need to try and open this file on your own, as it's just there to help your Gallery app show you your pictures and videos faster.
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