How to add many images in thumbnail?

  • Trying to add a gallery of 15 pictures.
    I Have a two problems.
    1. Toolbar does not fit the screen size. How to add a scrolling?
    2. Images have a different orientation, but size is set in a thumbnail are identical for all images. How do I change the size of each thumbnails? Or how to add a specially prepared thumbnails of images?

    Thanks

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