Multiple Image Picker in Xamarin.Forms

Hi everyone, I'm new to this forum and I'm kinda new also with xamarin (just 2 months).

I'm developing an app that allows users to choose a product and apply some customizations to it like adding an image, move that image within the frame and so on...

I'm stuck with the part of the multipicker from the gallery.

I've tried many solutions suggested by many developers but all of them didn't seem to work for me: they actually do open the gallery and let user pick an image but I need to select more than one at a time!

I've tried both implementing code in my project and then downloading the sample from github of those projects and install it on my phone (Android 8.0) and even on an emulator (Android 4.0).

None of this worked for me.

I need a solution that works both for android and for iOs and I'm afraid that doesn't actually exists.

If you want to know more about what I've already tried just ask, moreover is really xamarin worth it for app development? Would you reccomend it or is it better going for Java/Kotlin & C++/Swift/XCode?

Sorry if I mispelled something, english isn't my primary language.