How to store images in possible IndexedDB even name key?

The issue is that a little abstract so let me explain.

Suppose I do a Web page that is only for offline use, say an image viewer so that users can display their full-screen photos.

The user has the option to select files or drag-and - drop files
https://developer.Mozilla.org/en-us/docs/Using_files_from_web_applications

The files are then iteratively stored in IndexedDB.

When the user closes the browser and returns the next day and opens to the top of the Web page, the images are automatically loaded instead of having the user select the pictures again.

The problem comes when the user first downloads the images. Some images may have the same name.

What I need to check if the 'key' already exists in the DB before hand or can I store the path of the image file in the DB as key?

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Aid to this forum are better informed on issues related to web development.

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