@Niklas why are you passing the image file as an image ? In shortcuts, you could save it in Files.

Édit: what do you want to do with this image in Pythonista?

@resserone13 something like (not tested):

def add_btn(self, btn_names, actions_list):
    for i in range(len(btn_names)):
        btn = ui.Button()
        btn.name = btn_names[i]
        btn.action = actions_list[i]

Url="pythonista3://yourfolder/your script.py?action=run"
Open url

Script in local Pythonista files

@Niklas I think that it could be possible that
In Pythonista

• you ask/get the image
• you save the file in Files (in an external folder)
• you start a shortcut which
  In your shortcut
• you get the file from Files
• you convert to jpeg2000
• you save in Files
• you start Pythonista script
  In Pythonista
• you get the converted file
• ...

Édit: sorry, if it was what you want to say by "Hopefully it will be possible to do this in Pythonista eventually."

@frankL it was possible in the past but no more. Read this for a workaround via Shortcuts app

@Python567 no problem 😉

@Python567 said:

No

Why no?

@Python567 try already with

        tf.text = 'Die Zahl ' + str(p) + ' ist eine Primzahl.'