File Drop to execute a script

[aiotter]

Is your feature request related to a problem? Please describe.
I want to use CotEditor to write a blog content in markdown.
Whenever I put images in the document, I always upload the images to Cloudinary and put the URL into the document.
I'll be really happy if your app automates this process.

Describe the solution you'd like

1. Specify an executable file upload-to-cloudinary (which is in my $PATH) on a new column "Command" on Preferences > File Drop.
2. Drag and Drop the image file image.jpg into CotEditor window.
3. CotEditor will execute a program. upload-to-cloudinary /full/path/to/image.jpg
4. Set the stdout of the program to a variable <<<OUTPUT>>>.

File Drop Definitions table will look like:

Extensions	Syntax Style	Command	Description
jpg, jpeg, gif, png	Markdown	upload-to-cloudinary
All	Markdown
jpg, jpeg, gif, png	HTML	upload-to-cloudinary
js	HTML	esbuild --minify
html, htm, php	HTML
All	CSS
...	...	...	...

Describe alternatives you've considered
The simplest solution I imagine is already described above.
It's better if you can specify how to call the executable file more precisely using environment variable, like upload-to-cloudinary $FILE_PATH | yet-another-command. It may extremely helpful when you want to execute complex string modification with sed and awk.

Additional context
Nothing more. I really like the UI of CotEditor. Keep going 💪

[aiotter]

I tried the latest branch of MarkText, which has almost the same api as I suggested, and found it really nice if you can pass secrets to the program. This is a feature they lack in MarkText.
Like this: upload-to-cloudinary ThIS-Is-mY_SEcrET_KeY0128dvwkef $FILE_PATH

I love the UI of the CotEditor over MarkText. WYSIWYG is not my preference. I want to see the uploading feature implemented!