Hello everyone

I bought a new phone, Galaxy mini, I used to have a Samsung gt5230, there were a lot of photos and videos in that phone, but when I installed a flash card, micro card on a new phone, the videos and photos disappeared, the smallest part of them https://benq.com.ng/page-canon-powershot-a410-digital-camera-review remained, some files remained, but when opening they highlight an error, it is not possible to open a non-existent file, there is nothing left in that phone, no photo, no video, Maybe it’s all about the format? Or what? The phone was updated, tell me how to solve this problem!