Upload to Gallery code

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As i mentioned before, you should refresh the gallery dataset after uploading the file so that it’ll display all the images. So, first you have to create a dataset - galleryDS- which contains your images, then connect your gallery element with that dataset. Finally, as you figured out the upload button, just refresh the dataset right after uploading the file. Ex :

$w("#uploadButton").startUpload()
            .then((uploadedFile) => {
                wixData.insert("gallery", uploadedFile).then(() => {
                    $w("#galleryDS").refresh(); // this will refresh the gallery dataset ( you called it - upload folder - and shows all the images in that dataset.
            });

            })

Hope this helps!
Best,

Mustafa