Dear Rose Tyler,
Thanks for your guidance. I try myself to solve above mentioned minor issues but didnt worked and now 4 days ago i have hired a SPEED optimization expert who has optimised my websiteis uploading very quick. But he couldnt solve the issues which i have posted you in my previous above mentioned post.
* Image gallery doesnt appear on any product page as i want to show multiple images for each single product.
* As you mentioned we tried to replace this button link: https://prnt.sc/sldw65 to previous page (Vorige Pagina). But after that we got this result: https://prntscr.com/tr9lkd. You can see the button disappeard.
Please have a look into this if these can be resolved.