How to transfer an old app from Google phone to e/OS phone

Hi all,
I hope my topic will supported by the community and correctly stored!
I’m going to switch my Google phone (OnePlus) to e/OS, but for the time being I’m testing all the apps I have on my Google phone to e/OS phone (Galaxy S8).
It could be weird but I enjoy an old app I still use on my Google phone which is no longer available on the Play Store.
So, my question is, how can I transfer this app to my e/OS phone? is there any tool to transfer from phone to phone? Does an option exist?

Thank you in advance for your help.

Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online servicesphone

You could export the APK file(s) of the App with a tool like SAI, transfer the file(s) to the other phone and install there with the file manager (or with SAI again).

There are other similar tools to do this, but make sure they support so-called split APKs, just to cover this possibility.

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Thanks for your quick reply and advice. I’ll install and try SAI and provide feedback.