When you are done working with a file, you can export your file or tap the home button to save your work and then exit the app. These will save your work as a cloud document which you can find from the web or several adobe apps that use that file type.
It is a bit confusing, but if you want to close out. of the current image and get back to the main screen, tap the home button in the upper left. that will close the file.
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