Need help for upload image

Hi i am trying to save my user uploaded image to the dataset but how i try also cant, is there any way to solve this problem?

 "attachment" : $w('#attachmentUpload').value ,

"attachment is the field i want to insert , $w(‘#attachmentUpload’).value is the upload button

import wixLocation from 'wix-location';
import wixData from 'wix-data';

export function deposit_click(event) { 
    $w("#errorMessage").collapse();
    $w("#doneGif").collapse();
    $w("#wait").expand(); 
    $w("#waitGif").expand(); 
 let toInsert = { 
 "types" : "DEPOSIT" ,
 "setScore" : " + " ,
 "amounts" : Number($w('#amounts').value) ,
 "channel" : $w('#channel').value ,
 "attachment" : $w('#attachmentUpload').value ,
 "tips": Number("0") ,
 "reference" : $w('#reference').value ,
 "status" : "NEW REQUEST" ,
 "remark" : " " ,
 "bonus" : $w('#bonus').value ,
 "companyAccount" : $w('#companyAccount').value ,
 "casino" : $w('#casino').value ,
 "userAccount" : " " ,
 }; 
    wixData.insert("Cashier", toInsert)
 .then( (results) => {
 let item = results; 
        $w("#errorMessage").collapse();
        $w("#wait").collapse(); 
        $w("#waitGif").collapse(); 
        $w("#doneGif").expand(); 
        wixLocation.to('/account/history') ; 
 })
 .catch( (err) => {
        console.log(err);
        $w("#errorMessage").expand();
        $w("#wait").collapse(); 
        $w("#waitGif").collapse(); 
        $w("#doneGif").collapse(); 
 })
}

/**
*   Adds an event handler that runs when an input element's value
 is changed.
*    @param {$w.Event} event
*/
export function attachmentUpload_change(event) {
 // This function was added from the Properties & Events panel. To learn more, visit http://wix.to/UcBnC-4
 // Add your code for this event here: 
}

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