Update/Insert in to two database collections?

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This is the update of my question:
This is my dynamic page “Users (ID)”:

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And here is the code:

import wixUsers from 'wix-users';
import wixData from 'wix-data';
import wixlocation from 'wix-location';// For full API documentation, including code examples, visit http://wix.to/94BuAAs

$w.onReady(function () {
    $w('#button3').onClick(function () { //#button3 is SUBMIT button ID
        let username = $w('#username').value;
        let email = $w('#email').value;
        let age = $w('#age').value;
        let eyecolor = $w('#eyecolor').value;
        let height = $w('#height').value;
        let weight = $w('#weight').value;
        let otherinfo = $w('#otherinfo').value;

        let userInfo = {
            "username": username,
            "email": email,
            "age": age,
            "eyeColor": eyecolor,
            "height": height,
            "weight": weight,
            "additionalInformation": otherinfo,
            };

    wixData.save("Users", userInfo)
        .then( (results) => {
            let userItem = results; 

            if($w("#uploadButton2").value.length > 0) {
                let image = $w("#uploadButton2").value;
                let userImage = {
                    "image": image,
                    "userId": userItem['_id'],
                };
                wixData.insert("UserImages", userImage)
                .then(() =>{
                    wixlocation.to('/Users/${wixUsers.currentUser.id}')
                })
            }
                } )
        .catch( (err) => {
            let errorMsg = err;
        } );


    })
});

But this code doesn’t work. Nothing is inserted/updated in the database collections!
`I hope someone can now tell me where are my errors in the code/structure!