Sending images package to app

could you add some example how i can integrate in custom app importing and exporting a package with images?

I know how to upload and download file(there is such example on this forum) so it is more about dealing with files on LM (read/create .zip, saving multiple files)
Done is better than perfect
There are no built-in functions for handling archives. You have to use shell commands via os.execute to create/read archives.
You can also try doing this in browser via JSZip:

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