Try the following steps with any media player on your device. If the data is on the SD card, copy the file to the device's memory. Then try to play the data. Please note that it is best to use only Mp4 data as a movie. Otherwise there is an alternative with Libertine and the Kodi Mediacenter with effort. You can also try the hint with audio data.

@yeke_yoke Thanks for the flowers. We are all in the same boat, and the boat is not so huge, so yes, now and then it will happen that we engage like this