[Feature Request] Add a way to import images into the Downloaded section

[robertr2005]

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Most people I know use this app as a way to neatly manage their favorited posts list on various websites. However, there's also some posts that are only available through other means (say, Twitter or Discord), and currently, there is no way to view these images inside the app in a easy way. There should be a feature that would let a user "share" a image to the app, from which it would add it into the app under the Downloaded section, from which you could add in tags inside the app like you would with an actual snatched image.