Guess Mode, where the application attempts to guess the file type based on the URL provided in text file.

https://i.imgur.com/AdfU8FT.png
https://s1.webmshare.com/azr96.webm

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Descriptive Mode, where the application gets informed on how to load the URL. (Essentially a JSON file.)

[
  { "url": "https://i.imgur.com/AdfU8FT.png", "type": "image" },
  { "url": "https://webmshare.com/play/azr96", "type": "video" }
]