How to produce screenshots for the Apple Store?

I have to publish an Ionic app on the Apple Store.
They require screenshot of the app for many devices: iphones and tablet of different sizes.
I only have an Iphone.
How can I produce the screenshot for Pad Pro (2nd Gen) 12.9" Display and iPad Pro (3rd Gen) 12.9" Display without having these devices?
Are there online tools to do this?

thank you very much


You should be able to compile the app in XCode and choose an emulator to run it on. From there, just take some screen shots on that emulated device.

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Thank you I’ve used some screeshots taken from the XCode simulator. I hope they will be accepted.