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I guess you want to write a custom interprogram-paste-function which checks to see if the value is a valid filename and, if so, establishes it relative to default-directory in the current buffer.
(Sounds like freakish behaviour to me, but maybe that's just me.)
Thank you appreciate it
You can use yank-media to do whatever you want with non-text selections in your clipboard. You can find an example of a function that attaches files copied using a file manager to an org file in this patch: https://yhetil.org/orgmode/87jzsintv0.fsf@gmail.com/
HTH.
There's a thing called org-download that does a similar thing but I don't know how trustworthy it is.
The latest version of markdown-mode already support media handler for images and drag and drop images.
https://github.com/jrblevin/markdown-mode/commit/e10e5af
You need to to update to Emacs 29.1 or later version to use this new feature.
And the org-mode support will also coming soon.
https://list.orgmode.org/87a5s98x67.fsf@gmail.com/T/#m3c072c13b245eedd20241a84e7ee2efbde8dd88a
Note that if you want to copy (image path or image contents) and paste, you need to use yank-media on the emacs side, otherwise it just pastes the latest copied text.
(But drag and drop will just do what you mean.)