After you have used a flash drive (USB drive) to install Ina OS, it can be returned to its normal state, when any files can be written to it. It's easy to do.
4. The interface of the Disks program will open, select the flash drive on the left (it will most likely have the smallest size in gigabytes)
5. At the top right in the menu in the form of three dots, select "Format disk..."
6. Click “Format...”
7. In the warning window, click “Format” again.
8. Formatting is complete, the flash drive is empty, but now we need to create a file system on it
9. Tap the plus sign in the center of the screen to create a section
10. Click "Next"
11. Enter a name for the flash drive (we recommend using an English letter) and select FAT support ("For use with all systems and devices") - this will allow the flash drive to work with any computer (Linux, MacOS, Windows), then click "Create"
12. Done, the flash drive can now be used as a regular file storage device
13. In the file manager you can see the USB flash drive and write files to it