Files gone after cancelled transfer of DCIM to SDCARD by ES file explorer

Hello, so yesterday I bought a 32GB SanDisk MicroSD card. It came with a adapter to a regular SD card so I used it to backup files from my old 8GB microSD card then swap them and put the old SD files to the new card. Then I went to internal memory and started to transfer the DCIM to the SD card, but it said overwrite or something (Main language isn't Engish so I don't know how to translate) and I cancelled it. Then I see that I have 4.5GB free space when before I had like 200MB free. Then I check and I don't see my 800 photos and videos neither in my SD nor the internal memory. The more I use the device the more it uses space, which I think is over-writing the photos now right? How do I get my photos and videos back (at least some of them)?
My phone is Samsung Galaxy S5+ and the Android version is 6.0.1. My phone is not rooted.
Thanks.

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