Insertion of sd card and some images videos miss8ng S7

Hi. I inserted a new SD card into my S7 phone and moved everything from my camera onto the SD card. There were over 2700 items in camera folder. This took a few hours to transfer. When I woke up in the morning, transfer was complete however the SD folder was only showing 2200 items. When clicking on items, somr were not loading, had an explantion mark or a mountain. Some videos and images were missing. Furthermore, the old camera folder had now gone down to 1900 so even more items were missing. Whilst pocking further, i could see around 5am when image were getting tranferred, some of them were not transferred over as they were grey in the middle I.e. a grey image was placed onto of half the images. I can't see any further items which were downloaded after this time. How can I get these images and videos back

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